s/Show/Debug/g

src/compiletest/errors.rs

@@ -17,7 +17,7 @@ pub struct ExpectedError {
     pub msg: String,
 }
 
-#[derive(PartialEq, Show)]
+#[derive(PartialEq, Debug)]
 enum WhichLine { ThisLine, FollowPrevious(uint), AdjustBackward(uint) }
 
 /// Looks for either "//~| KIND MESSAGE" or "//~^^... KIND MESSAGE"

src/doc/trpl/error-handling.md

@@ -147,10 +147,10 @@ for all but the most trivial of situations.
 Here's an example of using `Result`:
 
 ```rust
-#[derive(Show)]
+#[derive(Debug)]
 enum Version { Version1, Version2 }
 
-#[derive(Show)]
+#[derive(Debug)]
 enum ParseError { InvalidHeaderLength, InvalidVersion }
 
 fn parse_version(header: &[u8]) -> Result<Version, ParseError> {

src/doc/trpl/pointers.md

@@ -605,7 +605,7 @@ Sometimes, you need a recursive data structure. The simplest is known as a
 
 
 ```{rust}
-#[derive(Show)]
+#[derive(Debug)]
 enum List<T> {
     Cons(T, Box<List<T>>),
     Nil,

src/liballoc/arc.rs

@@ -814,6 +814,6 @@ mod tests {
     }
 
     // Make sure deriving works with Arc<T>
-    #[derive(Eq, Ord, PartialEq, PartialOrd, Clone, Show, Default)]
+    #[derive(Eq, Ord, PartialEq, PartialOrd, Clone, Debug, Default)]
     struct Foo { inner: Arc<int> }
 }

src/liballoc/boxed.rs

@@ -29,7 +29,7 @@
 //! Creating a recursive data structure:
 //!
 //! ```
-//! #[derive(Show)]
+//! #[derive(Debug)]
 //! enum List<T> {
 //!     Cons(T, Box<List<T>>),
 //!     Nil,

src/libcollections/enum_set.rs

@@ -272,7 +272,7 @@ mod test {
 
     use super::{EnumSet, CLike};
 
-    #[derive(Copy, PartialEq, Show)]
+    #[derive(Copy, PartialEq, Debug)]
     #[repr(uint)]
     enum Foo {
         A, B, C

src/libcollections/ring_buf.rs

@@ -1852,21 +1852,21 @@ mod tests {
         })
     }
 
-    #[derive(Clone, PartialEq, Show)]
+    #[derive(Clone, PartialEq, Debug)]
     enum Taggy {
         One(int),
         Two(int, int),
         Three(int, int, int),
     }
 
-    #[derive(Clone, PartialEq, Show)]
+    #[derive(Clone, PartialEq, Debug)]
     enum Taggypar<T> {
         Onepar(int),
         Twopar(int, int),
         Threepar(int, int, int),
     }
 
-    #[derive(Clone, PartialEq, Show)]
+    #[derive(Clone, PartialEq, Debug)]
     struct RecCy {
         x: int,
         y: int,

src/libcollections/string.rs

@@ -41,7 +41,7 @@ pub struct String {
 
 /// A possible error value from the `String::from_utf8` function.
 #[stable(feature = "rust1", since = "1.0.0")]
-#[derive(Show)]
+#[derive(Debug)]
 pub struct FromUtf8Error {
     bytes: Vec<u8>,
     error: Utf8Error,
@@ -50,7 +50,7 @@ pub struct FromUtf8Error {
 /// A possible error value from the `String::from_utf16` function.
 #[stable(feature = "rust1", since = "1.0.0")]
 #[allow(missing_copy_implementations)]
-#[derive(Show)]
+#[derive(Debug)]
 pub struct FromUtf16Error(());
 
 impl String {

src/libcollections/vec.rs

@@ -811,7 +811,7 @@ impl<T> Vec<T> {
     /// let w = v.map_in_place(|i| i + 3);
     /// assert_eq!(w.as_slice(), [3, 4, 5].as_slice());
     ///
-    /// #[derive(PartialEq, Show)]
+    /// #[derive(PartialEq, Debug)]
     /// struct Newtype(u8);
     /// let bytes = vec![0x11, 0x22];
     /// let newtyped_bytes = bytes.map_in_place(|x| Newtype(x));
@@ -2279,7 +2279,7 @@ mod tests {
     #[test]
     fn test_map_in_place_zero_sized() {
         let v = vec![(), ()];
-        #[derive(PartialEq, Show)]
+        #[derive(PartialEq, Debug)]
         struct ZeroSized;
         assert_eq!(v.map_in_place(|_| ZeroSized), [ZeroSized, ZeroSized]);
     }
@@ -2288,11 +2288,11 @@ mod tests {
     fn test_map_in_place_zero_drop_count() {
         use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT};
 
-        #[derive(Clone, PartialEq, Show)]
+        #[derive(Clone, PartialEq, Debug)]
         struct Nothing;
         impl Drop for Nothing { fn drop(&mut self) { } }
 
-        #[derive(Clone, PartialEq, Show)]
+        #[derive(Clone, PartialEq, Debug)]
         struct ZeroSized;
         impl Drop for ZeroSized {
             fn drop(&mut self) {

src/libcore/any.rs

@@ -166,7 +166,7 @@ impl Any {
 ///
 /// A `TypeId` is currently only available for types which ascribe to `'static`,
 /// but this limitation may be removed in the future.
-#[derive(Clone, Copy, PartialEq, Eq, Show, Hash)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct TypeId {
     t: u64,

src/libcore/cmp.rs

@@ -105,7 +105,7 @@ pub trait Eq: PartialEq<Self> {
 }
 
 /// An ordering is, e.g, a result of a comparison between two values.
-#[derive(Clone, Copy, PartialEq, Show)]
+#[derive(Clone, Copy, PartialEq, Debug)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum Ordering {
     /// An ordering where a compared value is less [than another].

src/libcore/fmt/mod.rs

@@ -48,7 +48,7 @@ pub type Result = result::Result<(), Error>;
 /// some other means.
 #[unstable(feature = "core",
            reason = "core and I/O reconciliation may alter this definition")]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub struct Error;
 
 /// A collection of methods that are required to format a message into a stream.

src/libcore/iter.rs

@@ -1224,7 +1224,7 @@ impl_multiplicative! { f32,  1.0 }
 impl_multiplicative! { f64,  1.0 }
 
 /// `MinMaxResult` is an enum returned by `min_max`. See `IteratorOrdExt::min_max` for more detail.
-#[derive(Clone, PartialEq, Show)]
+#[derive(Clone, PartialEq, Debug)]
 #[unstable(feature = "core",
            reason = "unclear whether such a fine-grained result is widely useful")]
 pub enum MinMaxResult<T> {

src/libcore/marker.rs

@@ -50,7 +50,7 @@ pub trait Sized {
 /// words:
 ///
 /// ```
-/// #[derive(Show)]
+/// #[derive(Debug)]
 /// struct Foo;
 ///
 /// let x = Foo;
@@ -66,7 +66,7 @@ pub trait Sized {
 ///
 /// ```
 /// // we can just derive a `Copy` implementation
-/// #[derive(Show, Copy)]
+/// #[derive(Debug, Copy)]
 /// struct Foo;
 ///
 /// let x = Foo;

src/libcore/nonzero.rs

@@ -31,7 +31,7 @@ unsafe impl Zeroable for u64 {}
 /// A wrapper type for raw pointers and integers that will never be
 /// NULL or 0 that might allow certain optimizations.
 #[lang="non_zero"]
-#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Show, Hash)]
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug, Hash)]
 #[unstable(feature = "core")]
 pub struct NonZero<T: Zeroable>(T);
 

src/libcore/num/mod.rs

@@ -1241,7 +1241,7 @@ impl_num_cast! { f32,   to_f32 }
 impl_num_cast! { f64,   to_f64 }
 
 /// Used for representing the classification of floating point numbers
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 #[unstable(feature = "core", reason = "may be renamed")]
 pub enum FpCategory {
     /// "Not a Number", often obtained by dividing by zero

src/libcore/ops.rs

@@ -35,7 +35,7 @@
 //! ```rust
 //! use std::ops::{Add, Sub};
 //!
-//! #[derive(Show)]
+//! #[derive(Debug)]
 //! struct Point {
 //!     x: int,
 //!     y: int

src/libcore/option.rs

@@ -163,7 +163,7 @@ use slice;
 // which basically means it must be `Option`.
 
 /// The `Option` type.
-#[derive(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Show, Hash)]
+#[derive(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Debug, Hash)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum Option<T> {
     /// No value

src/libcore/result.rs

@@ -30,7 +30,7 @@
 //! defined and used like so:
 //!
 //! ```
-//! #[derive(Show)]
+//! #[derive(Debug)]
 //! enum Version { Version1, Version2 }
 //!
 //! fn parse_version(header: &[u8]) -> Result<Version, &'static str> {
@@ -239,7 +239,7 @@ use slice;
 /// `Result` is a type that represents either success (`Ok`) or failure (`Err`).
 ///
 /// See the [`std::result`](index.html) module documentation for details.
-#[derive(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Show, Hash)]
+#[derive(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Debug, Hash)]
 #[must_use]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum Result<T, E> {

src/libcore/simd.rs

@@ -38,7 +38,7 @@
 
 #[unstable(feature = "core")]
 #[simd]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 #[repr(C)]
 pub struct i8x16(pub i8, pub i8, pub i8, pub i8,
                  pub i8, pub i8, pub i8, pub i8,
@@ -47,26 +47,26 @@ pub struct i8x16(pub i8, pub i8, pub i8, pub i8,
 
 #[unstable(feature = "core")]
 #[simd]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 #[repr(C)]
 pub struct i16x8(pub i16, pub i16, pub i16, pub i16,
                  pub i16, pub i16, pub i16, pub i16);
 
 #[unstable(feature = "core")]
 #[simd]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 #[repr(C)]
 pub struct i32x4(pub i32, pub i32, pub i32, pub i32);
 
 #[unstable(feature = "core")]
 #[simd]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 #[repr(C)]
 pub struct i64x2(pub i64, pub i64);
 
 #[unstable(feature = "core")]
 #[simd]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 #[repr(C)]
 pub struct u8x16(pub u8, pub u8, pub u8, pub u8,
                  pub u8, pub u8, pub u8, pub u8,
@@ -75,31 +75,31 @@ pub struct u8x16(pub u8, pub u8, pub u8, pub u8,
 
 #[unstable(feature = "core")]
 #[simd]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 #[repr(C)]
 pub struct u16x8(pub u16, pub u16, pub u16, pub u16,
                  pub u16, pub u16, pub u16, pub u16);
 
 #[unstable(feature = "core")]
 #[simd]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 #[repr(C)]
 pub struct u32x4(pub u32, pub u32, pub u32, pub u32);
 
 #[unstable(feature = "core")]
 #[simd]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 #[repr(C)]
 pub struct u64x2(pub u64, pub u64);
 
 #[unstable(feature = "core")]
 #[simd]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 #[repr(C)]
 pub struct f32x4(pub f32, pub f32, pub f32, pub f32);
 
 #[unstable(feature = "core")]
 #[simd]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 #[repr(C)]
 pub struct f64x2(pub f64, pub f64);

src/libcore/str/mod.rs

@@ -144,7 +144,7 @@ Section: Creating a string
 */
 
 /// Errors which can occur when attempting to interpret a byte slice as a `str`.
-#[derive(Copy, Eq, PartialEq, Clone, Show)]
+#[derive(Copy, Eq, PartialEq, Clone, Debug)]
 #[unstable(feature = "core",
            reason = "error enumeration recently added and definitions may be refined")]
 pub enum Utf8Error {

src/libcoretest/any.rs

@@ -11,7 +11,7 @@ use core::any::*;
 use test::Bencher;
 use test;
 
-#[derive(PartialEq, Show)]
+#[derive(PartialEq, Debug)]
 struct Test;
 
 static TEST: &'static str = "Test";

src/libgetopts/lib.rs

@@ -111,7 +111,7 @@ use std::iter::repeat;
 use std::result;
 
 /// Name of an option. Either a string or a single char.
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub enum Name {
     /// A string representing the long name of an option.
     /// For example: "help"
@@ -122,7 +122,7 @@ pub enum Name {
 }
 
 /// Describes whether an option has an argument.
-#[derive(Clone, Copy, PartialEq, Eq, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
 pub enum HasArg {
     /// The option requires an argument.
     Yes,
@@ -133,7 +133,7 @@ pub enum HasArg {
 }
 
 /// Describes how often an option may occur.
-#[derive(Clone, Copy, PartialEq, Eq, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
 pub enum Occur {
     /// The option occurs once.
     Req,
@@ -144,7 +144,7 @@ pub enum Occur {
 }
 
 /// A description of a possible option.
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct Opt {
     /// Name of the option
     pub name: Name,
@@ -158,7 +158,7 @@ pub struct Opt {
 
 /// One group of options, e.g., both `-h` and `--help`, along with
 /// their shared description and properties.
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct OptGroup {
     /// Short name of the option, e.g. `h` for a `-h` option
     pub short_name: String,
@@ -175,7 +175,7 @@ pub struct OptGroup {
 }
 
 /// Describes whether an option is given at all or has a value.
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 enum Optval {
     Val(String),
     Given,
@@ -183,7 +183,7 @@ enum Optval {
 
 /// The result of checking command line arguments. Contains a vector
 /// of matches and a vector of free strings.
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct Matches {
     /// Options that matched
     opts: Vec<Opt>,
@@ -196,7 +196,7 @@ pub struct Matches {
 /// The type returned when the command line does not conform to the
 /// expected format. Use the `Show` implementation to output detailed
 /// information.
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub enum Fail {
     /// The option requires an argument but none was passed.
     ArgumentMissing(String),
@@ -211,7 +211,7 @@ pub enum Fail {
 }
 
 /// The type of failure that occurred.
-#[derive(Copy, PartialEq, Eq, Show)]
+#[derive(Copy, PartialEq, Eq, Debug)]
 #[allow(missing_docs)]
 pub enum FailType {
     ArgumentMissing_,

src/libgraphviz/lib.rs

@@ -523,7 +523,7 @@ pub trait GraphWalk<'a, N, E> {
     fn target(&'a self, edge: &E) -> N;
 }
 
-#[derive(Copy, PartialEq, Eq, Show)]
+#[derive(Copy, PartialEq, Eq, Debug)]
 pub enum RenderOption {
     NoEdgeLabels,
     NoNodeLabels,

src/liblog/directive.rs

@@ -11,7 +11,7 @@
 use std::ascii::AsciiExt;
 use std::cmp;
 
-#[derive(Show, Clone)]
+#[derive(Debug, Clone)]
 pub struct LogDirective {
     pub name: Option<String>,
     pub level: u32,

src/liblog/lib.rs

@@ -243,7 +243,7 @@ struct DefaultLogger {
 }
 
 /// Wraps the log level with fmt implementations.
-#[derive(Copy, PartialEq, PartialOrd, Show)]
+#[derive(Copy, PartialEq, PartialOrd, Debug)]
 pub struct LogLevel(pub u32);
 
 impl fmt::Display for LogLevel {
@@ -330,7 +330,7 @@ pub fn set_logger(logger: Box<Logger + Send>) -> Option<Box<Logger + Send>> {
 
 /// A LogRecord is created by the logging macros, and passed as the only
 /// argument to Loggers.
-#[derive(Show)]
+#[derive(Debug)]
 pub struct LogRecord<'a> {
 
     /// The module path of where the LogRecord originated.

src/librand/distributions/mod.rs

@@ -263,7 +263,7 @@ mod tests {
     use {Rng, Rand};
     use super::{RandSample, WeightedChoice, Weighted, Sample, IndependentSample};
 
-    #[derive(PartialEq, Show)]
+    #[derive(PartialEq, Debug)]
     struct ConstRand(uint);
     impl Rand for ConstRand {
         fn rand<R: Rng>(_: &mut R) -> ConstRand {

src/librbml/lib.rs

@@ -77,7 +77,7 @@ pub struct TaggedDoc<'a> {
     pub doc: Doc<'a>,
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum EbmlEncoderTag {
     EsUint,     // 0
     EsU64,      // 1
@@ -111,7 +111,7 @@ pub enum EbmlEncoderTag {
     EsLabel, // Used only when debugging
 }
 
-#[derive(Show)]
+#[derive(Debug)]
 pub enum Error {
     IntTooBig(uint),
     Expected(String),

src/librustc/lint/mod.rs

@@ -40,7 +40,7 @@ use syntax::ast;
 pub use lint::context::{Context, LintStore, raw_emit_lint, check_crate, gather_attrs};
 
 /// Specification of a single lint.
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub struct Lint {
     /// A string identifier for the lint.
     ///
@@ -207,7 +207,7 @@ impl LintId {
 }
 
 /// Setting for how to handle a lint.
-#[derive(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Show)]
+#[derive(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Debug)]
 pub enum Level {
     Allow, Warn, Deny, Forbid
 }

src/librustc/metadata/common.rs

@@ -219,7 +219,7 @@ pub const tag_items_data_item_stability: uint = 0x92;
 
 pub const tag_items_data_item_repr: uint = 0x93;
 
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct LinkMeta {
     pub crate_name: String,
     pub crate_hash: Svh,

src/librustc/metadata/cstore.rs

@@ -49,7 +49,7 @@ pub struct crate_metadata {
     pub span: Span,
 }
 
-#[derive(Copy, Show, PartialEq, Clone)]
+#[derive(Copy, Debug, PartialEq, Clone)]
 pub enum LinkagePreference {
     RequireDynamic,
     RequireStatic,

src/librustc/metadata/decoder.rs

@@ -493,7 +493,7 @@ pub fn get_symbol(data: &[u8], id: ast::NodeId) -> String {
 }
 
 // Something that a name can resolve to.
-#[derive(Copy, Clone, Show)]
+#[derive(Copy, Clone, Debug)]
 pub enum DefLike {
     DlDef(def::Def),
     DlImpl(ast::DefId),

src/librustc/metadata/tydecode.rs

@@ -43,7 +43,7 @@ use syntax::parse::token;
 // def-id will depend on where it originated from.  Therefore, the conversion
 // function is given an indicator of the source of the def-id.  See
 // astencode.rs for more information.
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum DefIdSource {
     // Identifies a struct, trait, enum, etc.
     NominalType,

src/librustc/middle/dataflow.rs

@@ -28,7 +28,7 @@ use syntax::visit;
 use syntax::print::{pp, pprust};
 use util::nodemap::NodeMap;
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum EntryOrExit {
     Entry,
     Exit,

src/librustc/middle/def.rs

@@ -20,7 +20,7 @@ use syntax::ast_util::local_def;
 
 use std::cell::RefCell;
 
-#[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Def {
     DefFn(ast::DefId, bool /* is_ctor */),
     DefStaticMethod(/* method */ ast::DefId, MethodProvenance),
@@ -72,13 +72,13 @@ pub struct Export {
     pub def_id: ast::DefId, // The definition of the target.
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum MethodProvenance {
     FromTrait(ast::DefId),
     FromImpl(ast::DefId),
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum TyParamProvenance {
     FromSelf(ast::DefId),
     FromParam(ast::DefId),

src/librustc/middle/expr_use_visitor.rs

@@ -95,7 +95,7 @@ pub trait Delegate<'tcx> {
               mode: MutateMode);
 }
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum LoanCause {
     ClosureCapture(Span),
     AddrOf,
@@ -107,20 +107,20 @@ pub enum LoanCause {
     MatchDiscriminant
 }
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum ConsumeMode {
     Copy,                // reference to x where x has a type that copies
     Move(MoveReason),    // reference to x where x has a type that moves
 }
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum MoveReason {
     DirectRefMove,
     PatBindingMove,
     CaptureMove,
 }
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum MatchMode {
     NonBindingMatch,
     BorrowingMatch,
@@ -128,7 +128,7 @@ pub enum MatchMode {
     MovingMatch,
 }
 
-#[derive(PartialEq,Show)]
+#[derive(PartialEq,Debug)]
 enum TrackMatchMode<T> {
     Unknown,
     Definite(MatchMode),
@@ -197,7 +197,7 @@ impl<T> TrackMatchMode<T> {
     }
 }
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum MutateMode {
     Init,
     JustWrite,    // x = y

src/librustc/middle/graph.rs

@@ -61,18 +61,18 @@ impl<E: Debug> Debug for Edge<E> {
     }
 }
 
-#[derive(Clone, Copy, PartialEq, Show)]
+#[derive(Clone, Copy, PartialEq, Debug)]
 pub struct NodeIndex(pub uint);
 #[allow(non_upper_case_globals)]
 pub const InvalidNodeIndex: NodeIndex = NodeIndex(uint::MAX);
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub struct EdgeIndex(pub uint);
 #[allow(non_upper_case_globals)]
 pub const InvalidEdgeIndex: EdgeIndex = EdgeIndex(uint::MAX);
 
 // Use a private field here to guarantee no more instances are created:
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub struct Direction { repr: uint }
 #[allow(non_upper_case_globals)]
 pub const Outgoing: Direction = Direction { repr: 0 };

src/librustc/middle/infer/mod.rs

@@ -95,7 +95,7 @@ pub type SkolemizationMap = FnvHashMap<ty::BoundRegion,ty::Region>;
 /// Why did we require that the two types be related?
 ///
 /// See `error_reporting.rs` for more details
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 pub enum TypeOrigin {
     // Not yet categorized in a better way
     Misc(Span),
@@ -133,7 +133,7 @@ pub enum TypeOrigin {
 }
 
 /// See `error_reporting.rs` for more details
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub enum ValuePairs<'tcx> {
     Types(ty::expected_found<Ty<'tcx>>),
     TraitRefs(ty::expected_found<Rc<ty::TraitRef<'tcx>>>),
@@ -144,7 +144,7 @@ pub enum ValuePairs<'tcx> {
 /// encounter an error or subtyping constraint.
 ///
 /// See `error_reporting.rs` for more details.
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct TypeTrace<'tcx> {
     origin: TypeOrigin,
     values: ValuePairs<'tcx>,
@@ -153,7 +153,7 @@ pub struct TypeTrace<'tcx> {
 /// The origin of a `r1 <= r2` constraint.
 ///
 /// See `error_reporting.rs` for more details
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub enum SubregionOrigin<'tcx> {
     // Arose from a subtyping relation
     Subtype(TypeTrace<'tcx>),
@@ -222,7 +222,7 @@ pub enum SubregionOrigin<'tcx> {
 }
 
 /// Times when we replace late-bound regions with variables:
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 pub enum LateBoundRegionConversionTime {
     /// when a fn is called
     FnCall,
@@ -237,7 +237,7 @@ pub enum LateBoundRegionConversionTime {
 /// Reasons to create a region inference variable
 ///
 /// See `error_reporting.rs` for more details
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub enum RegionVariableOrigin<'tcx> {
     // Region variables created for ill-categorized reasons,
     // mostly indicates places in need of refactoring
@@ -270,7 +270,7 @@ pub enum RegionVariableOrigin<'tcx> {
     BoundRegionInCoherence(ast::Name),
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum fixup_err {
     unresolved_int_ty(IntVid),
     unresolved_float_ty(FloatVid),

src/librustc/middle/infer/region_inference/graphviz.rs

@@ -120,7 +120,7 @@ struct ConstraintGraph<'a, 'tcx: 'a> {
     node_ids: FnvHashMap<Node, uint>,
 }
 
-#[derive(Clone, Hash, PartialEq, Eq, Show)]
+#[derive(Clone, Hash, PartialEq, Eq, Debug)]
 enum Node {
     RegionVid(ty::RegionVid),
     Region(ty::Region),

src/librustc/middle/infer/region_inference/mod.rs

@@ -42,7 +42,7 @@ mod doc;
 mod graphviz;
 
 // A constraint that influences the inference process.
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub enum Constraint {
     // One region variable is subregion of another
     ConstrainVarSubVar(RegionVid, RegionVid),
@@ -69,7 +69,7 @@ pub enum Verify<'tcx> {
     VerifyGenericBound(GenericKind<'tcx>, SubregionOrigin<'tcx>, Region, Vec<Region>),
 }
 
-#[derive(Clone, Show, PartialEq, Eq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub enum GenericKind<'tcx> {
     Param(ty::ParamTy),
     Projection(ty::ProjectionTy<'tcx>),
@@ -97,7 +97,7 @@ pub enum CombineMapType {
     Lub, Glb
 }
 
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub enum RegionResolutionError<'tcx> {
     /// `ConcreteFailure(o, a, b)`:
     ///
@@ -149,7 +149,7 @@ pub enum RegionResolutionError<'tcx> {
 /// ```
 /// would report an error because we expect 'a and 'b to match, and so we group
 /// 'a and 'b together inside a SameRegions struct
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct SameRegions {
     pub scope_id: ast::NodeId,
     pub regions: Vec<BoundRegion>
@@ -223,7 +223,7 @@ pub struct RegionVarBindings<'a, 'tcx: 'a> {
     values: RefCell<Option<Vec<VarValue>>>,
 }
 
-#[derive(Show)]
+#[derive(Debug)]
 #[allow(missing_copy_implementations)]
 pub struct RegionSnapshot {
     length: uint,
@@ -943,7 +943,7 @@ impl<'a, 'tcx> RegionVarBindings<'a, 'tcx> {
 
 // ______________________________________________________________________
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 enum Classification { Expanding, Contracting }
 
 #[derive(Copy)]

src/librustc/middle/infer/type_variable.rs

@@ -46,7 +46,7 @@ struct Delegate<'tcx>;
 
 type Relation = (RelationDir, ty::TyVid);
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum RelationDir {
     SubtypeOf, SupertypeOf, EqTo
 }

src/librustc/middle/infer/unify.rs

@@ -63,7 +63,7 @@ pub trait UnifyValue : Clone + PartialEq + Debug {
 /// to keep the DAG relatively balanced, which helps keep the running
 /// time of the algorithm under control. For more information, see
 /// <http://en.wikipedia.org/wiki/Disjoint-set_data_structure>.
-#[derive(PartialEq,Clone,Show)]
+#[derive(PartialEq,Clone,Debug)]
 pub enum VarValue<K:UnifyKey> {
     Redirect(K),
     Root(K::Value, uint),

src/librustc/middle/liveness.rs

@@ -159,7 +159,7 @@ impl Clone for LiveNode {
     }
 }
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 enum LiveNodeKind {
     FreeVarNode(Span),
     ExprNode(Span),
@@ -245,13 +245,13 @@ struct CaptureInfo {
     var_nid: NodeId
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 struct LocalInfo {
     id: NodeId,
     ident: ast::Ident
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 enum VarKind {
     Arg(NodeId, ast::Ident),
     Local(LocalInfo),

src/librustc/middle/mem_categorization.rs

@@ -87,7 +87,7 @@ use syntax::parse::token;
 use std::cell::RefCell;
 use std::rc::Rc;
 
-#[derive(Clone, PartialEq, Show)]
+#[derive(Clone, PartialEq, Debug)]
 pub enum categorization<'tcx> {
     cat_rvalue(ty::Region),                    // temporary val, argument is its scope
     cat_static_item,
@@ -101,14 +101,14 @@ pub enum categorization<'tcx> {
 }
 
 // Represents any kind of upvar
-#[derive(Clone, Copy, PartialEq, Show)]
+#[derive(Clone, Copy, PartialEq, Debug)]
 pub struct Upvar {
     pub id: ty::UpvarId,
     pub kind: ty::ClosureKind
 }
 
 // different kinds of pointers:
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub enum PointerKind {
     /// `Box<T>`
     Unique,
@@ -125,25 +125,25 @@ pub enum PointerKind {
 
 // We use the term "interior" to mean "something reachable from the
 // base without a pointer dereference", e.g. a field
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub enum InteriorKind {
     InteriorField(FieldName),
     InteriorElement(ElementKind),
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub enum FieldName {
     NamedField(ast::Name),
     PositionalField(uint)
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub enum ElementKind {
     VecElement,
     OtherElement,
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub enum MutabilityCategory {
     McImmutable, // Immutable.
     McDeclared,  // Directly declared as mutable.
@@ -155,7 +155,7 @@ pub enum MutabilityCategory {
 // Upvar categorization can generate a variable number of nested
 // derefs.  The note allows detecting them without deep pattern
 // matching on the categorization.
-#[derive(Clone, Copy, PartialEq, Show)]
+#[derive(Clone, Copy, PartialEq, Debug)]
 pub enum Note {
     NoteClosureEnv(ty::UpvarId), // Deref through closure env
     NoteUpvarRef(ty::UpvarId),   // Deref through by-ref upvar
@@ -176,7 +176,7 @@ pub enum Note {
 // dereference, but its type is the type *before* the dereference
 // (`@T`). So use `cmt.ty` to find the type of the value in a consistent
 // fashion. For more details, see the method `cat_pattern`
-#[derive(Clone, PartialEq, Show)]
+#[derive(Clone, PartialEq, Debug)]
 pub struct cmt_<'tcx> {
     pub id: ast::NodeId,           // id of expr/pat producing this value
     pub span: Span,                // span of same expr/pat

src/librustc/middle/privacy.rs

@@ -35,7 +35,7 @@ pub type PublicItems = NodeSet;
 // FIXME: dox
 pub type LastPrivateMap = NodeMap<LastPrivate>;
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum LastPrivate {
     LastMod(PrivateDep),
     // `use` directives (imports) can refer to two separate definitions in the
@@ -49,14 +49,14 @@ pub enum LastPrivate {
                type_used: ImportUse},
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum PrivateDep {
     AllPublic,
     DependsOn(ast::DefId),
 }
 
 // How an import is used.
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum ImportUse {
     Unused,       // The import is not used.
     Used,         // The import is used.

src/librustc/middle/region.rs

@@ -37,7 +37,7 @@ use syntax::visit::{Visitor, FnKind};
 /// actually attach a more meaningful ordering to scopes than the one
 /// generated via deriving here.
 #[derive(Clone, PartialEq, PartialOrd, Eq, Ord, Hash, RustcEncodable,
-           RustcDecodable, Show, Copy)]
+           RustcDecodable, Debug, Copy)]
 pub enum CodeExtent {
     Misc(ast::NodeId),
     Remainder(BlockRemainder),
@@ -61,7 +61,7 @@ pub enum CodeExtent {
 /// * the subscope with `first_statement_index == 1` is scope of `c`,
 ///   and thus does not include EXPR_2, but covers the `...`.
 #[derive(Clone, PartialEq, PartialOrd, Eq, Ord, Hash, RustcEncodable,
-         RustcDecodable, Show, Copy)]
+         RustcDecodable, Debug, Copy)]
 pub struct BlockRemainder {
     pub block: ast::NodeId,
     pub first_statement_index: uint,
@@ -179,7 +179,7 @@ pub struct RegionMaps {
 /// Carries the node id for the innermost block or match expression,
 /// for building up the `var_map` which maps ids to the blocks in
 /// which they were declared.
-#[derive(PartialEq, Eq, Show, Copy)]
+#[derive(PartialEq, Eq, Debug, Copy)]
 enum InnermostDeclaringBlock {
     None,
     Block(ast::NodeId),
@@ -204,7 +204,7 @@ impl InnermostDeclaringBlock {
 /// Contextual information for declarations introduced by a statement
 /// (i.e. `let`). It carries node-id's for statement and enclosing
 /// block both, as well as the statement's index within the block.
-#[derive(PartialEq, Eq, Show, Copy)]
+#[derive(PartialEq, Eq, Debug, Copy)]
 struct DeclaringStatementContext {
     stmt_id: ast::NodeId,
     block_id: ast::NodeId,
@@ -220,7 +220,7 @@ impl DeclaringStatementContext {
     }
 }
 
-#[derive(PartialEq, Eq, Show, Copy)]
+#[derive(PartialEq, Eq, Debug, Copy)]
 enum InnermostEnclosingExpr {
     None,
     Some(ast::NodeId),
@@ -242,7 +242,7 @@ impl InnermostEnclosingExpr {
     }
 }
 
-#[derive(Show, Copy)]
+#[derive(Debug, Copy)]
 pub struct Context {
     var_parent: InnermostDeclaringBlock,
 

src/librustc/middle/resolve_lifetime.rs

@@ -33,7 +33,7 @@ use syntax::visit;
 use syntax::visit::Visitor;
 use util::nodemap::NodeMap;
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Debug)]
 pub enum DefRegion {
     DefStaticRegion,
     DefEarlyBoundRegion(/* space */ subst::ParamSpace,

src/librustc/middle/subst.rs

@@ -28,7 +28,7 @@ use syntax::codemap::{Span, DUMMY_SP};
 /// identify each in-scope parameter by an *index* and a *parameter
 /// space* (which indices where the parameter is defined; see
 /// `ParamSpace`).
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct Substs<'tcx> {
     pub types: VecPerParamSpace<Ty<'tcx>>,
     pub regions: RegionSubsts,
@@ -37,7 +37,7 @@ pub struct Substs<'tcx> {
 /// Represents the values to use when substituting lifetime parameters.
 /// If the value is `ErasedRegions`, then this subst is occurring during
 /// trans, and all region parameters will be replaced with `ty::ReStatic`.
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub enum RegionSubsts {
     ErasedRegions,
     NonerasedRegions(VecPerParamSpace<ty::Region>)
@@ -180,7 +180,7 @@ impl RegionSubsts {
 // ParamSpace
 
 #[derive(PartialOrd, Ord, PartialEq, Eq, Copy,
-           Clone, Hash, RustcEncodable, RustcDecodable, Show)]
+           Clone, Hash, RustcEncodable, RustcDecodable, Debug)]
 pub enum ParamSpace {
     TypeSpace,  // Type parameters attached to a type definition, trait, or impl
     SelfSpace,  // Self parameter on a trait

src/librustc/middle/traits/mod.rs

@@ -147,7 +147,7 @@ pub type TraitObligations<'tcx> = subst::VecPerParamSpace<TraitObligation<'tcx>>
 
 pub type Selection<'tcx> = Vtable<'tcx, PredicateObligation<'tcx>>;
 
-#[derive(Clone,Show)]
+#[derive(Clone,Debug)]
 pub enum SelectionError<'tcx> {
     Unimplemented,
     Overflow,
@@ -215,7 +215,7 @@ pub type SelectionResult<'tcx, T> = Result<Option<T>, SelectionError<'tcx>>;
 /// ### The type parameter `N`
 ///
 /// See explanation on `VtableImplData`.
-#[derive(Show,Clone)]
+#[derive(Debug,Clone)]
 pub enum Vtable<'tcx, N> {
     /// Vtable identifying a particular impl.
     VtableImpl(VtableImplData<'tcx, N>),
@@ -258,7 +258,7 @@ pub struct VtableImplData<'tcx, N> {
     pub nested: subst::VecPerParamSpace<N>
 }
 
-#[derive(Show,Clone)]
+#[derive(Debug,Clone)]
 pub struct VtableBuiltinData<N> {
     pub nested: subst::VecPerParamSpace<N>
 }

src/librustc/middle/traits/object_safety.rs

@@ -36,7 +36,7 @@ pub enum ObjectSafetyViolation<'tcx> {
 }
 
 /// Reasons a method might not be object-safe.
-#[derive(Copy,Clone,Show)]
+#[derive(Copy,Clone,Debug)]
 pub enum MethodViolationCode {
     /// e.g., `fn(self)`
     ByValueSelf,

src/librustc/middle/traits/select.rs

@@ -96,7 +96,7 @@ pub enum MethodMatchResult {
     MethodDidNotMatch,
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum MethodMatchedData {
     // In the case of a precise match, we don't really need to store
     // how the match was found. So don't.
@@ -131,7 +131,7 @@ pub enum MethodMatchedData {
 /// matching where clause. Part of the reason for this is that where
 /// clauses can give additional information (like, the types of output
 /// parameters) that would have to be inferred from the impl.
-#[derive(PartialEq,Eq,Show,Clone)]
+#[derive(PartialEq,Eq,Debug,Clone)]
 enum SelectionCandidate<'tcx> {
     BuiltinCandidate(ty::BuiltinBound),
     ParamCandidate(ty::PolyTraitRef<'tcx>),
@@ -172,7 +172,7 @@ enum BuiltinBoundConditions<'tcx> {
     AmbiguousBuiltin
 }
 
-#[derive(Show)]
+#[derive(Debug)]
 enum EvaluationResult<'tcx> {
     EvaluatedToOk,
     EvaluatedToAmbig,

src/librustc/middle/ty.rs

@@ -112,7 +112,7 @@ pub struct field<'tcx> {
     pub mt: mt<'tcx>
 }
 
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 pub enum ImplOrTraitItemContainer {
     TraitContainer(ast::DefId),
     ImplContainer(ast::DefId),
@@ -127,7 +127,7 @@ impl ImplOrTraitItemContainer {
     }
 }
 
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub enum ImplOrTraitItem<'tcx> {
     MethodTraitItem(Rc<Method<'tcx>>),
     TypeTraitItem(Rc<AssociatedType>),
@@ -172,7 +172,7 @@ impl<'tcx> ImplOrTraitItem<'tcx> {
     }
 }
 
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 pub enum ImplOrTraitItemId {
     MethodTraitItemId(ast::DefId),
     TypeTraitItemId(ast::DefId),
@@ -187,7 +187,7 @@ impl ImplOrTraitItemId {
     }
 }
 
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct Method<'tcx> {
     pub name: ast::Name,
     pub generics: ty::Generics<'tcx>,
@@ -231,7 +231,7 @@ impl<'tcx> Method<'tcx> {
     }
 }
 
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 pub struct AssociatedType {
     pub name: ast::Name,
     pub vis: ast::Visibility,
@@ -239,13 +239,13 @@ pub struct AssociatedType {
     pub container: ImplOrTraitItemContainer,
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub struct mt<'tcx> {
     pub ty: Ty<'tcx>,
     pub mutbl: ast::Mutability,
 }
 
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 pub struct field_ty {
     pub name: Name,
     pub id: DefId,
@@ -274,7 +274,7 @@ pub struct ItemVariances {
     pub regions: VecPerParamSpace<Variance>,
 }
 
-#[derive(Clone, PartialEq, RustcDecodable, RustcEncodable, Show, Copy)]
+#[derive(Clone, PartialEq, RustcDecodable, RustcEncodable, Debug, Copy)]
 pub enum Variance {
     Covariant,      // T<A> <: T<B> iff A <: B -- e.g., function return type
     Invariant,      // T<A> <: T<B> iff B == A -- e.g., type of mutable cell
@@ -282,13 +282,13 @@ pub enum Variance {
     Bivariant,      // T<A> <: T<B>            -- e.g., unused type parameter
 }
 
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub enum AutoAdjustment<'tcx> {
     AdjustReifyFnPointer(ast::DefId), // go from a fn-item type to a fn-pointer type
     AdjustDerefRef(AutoDerefRef<'tcx>)
 }
 
-#[derive(Clone, PartialEq, Show)]
+#[derive(Clone, PartialEq, Debug)]
 pub enum UnsizeKind<'tcx> {
     // [T, ..n] -> [T], the uint field is n.
     UnsizeLength(uint),
@@ -298,13 +298,13 @@ pub enum UnsizeKind<'tcx> {
     UnsizeVtable(TyTrait<'tcx>, /* the self type of the trait */ Ty<'tcx>)
 }
 
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct AutoDerefRef<'tcx> {
     pub autoderefs: uint,
     pub autoref: Option<AutoRef<'tcx>>
 }
 
-#[derive(Clone, PartialEq, Show)]
+#[derive(Clone, PartialEq, Debug)]
 pub enum AutoRef<'tcx> {
     /// Convert from T to &T
     /// The third field allows us to wrap other AutoRef adjustments.
@@ -421,13 +421,13 @@ pub fn type_of_adjust<'tcx>(cx: &ctxt<'tcx>, adj: &AutoAdjustment<'tcx>) -> Opti
     }
 }
 
-#[derive(Clone, Copy, RustcEncodable, RustcDecodable, PartialEq, PartialOrd, Show)]
+#[derive(Clone, Copy, RustcEncodable, RustcDecodable, PartialEq, PartialOrd, Debug)]
 pub struct param_index {
     pub space: subst::ParamSpace,
     pub index: uint
 }
 
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub enum MethodOrigin<'tcx> {
     // fully statically resolved method
     MethodStatic(ast::DefId),
@@ -445,7 +445,7 @@ pub enum MethodOrigin<'tcx> {
 
 // details for a method invoked with a receiver whose type is a type parameter
 // with a bounded trait.
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct MethodParam<'tcx> {
     // the precise trait reference that occurs as a bound -- this may
     // be a supertrait of what the user actually typed. Note that it
@@ -466,7 +466,7 @@ pub struct MethodParam<'tcx> {
 }
 
 // details for a method invoked with a receiver whose type is an object
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct MethodObject<'tcx> {
     // the (super)trait containing the method to be invoked
     pub trait_ref: Rc<ty::TraitRef<'tcx>>,
@@ -503,13 +503,13 @@ pub struct MethodCallee<'tcx> {
 /// needed to add to the side tables. Thus to disambiguate
 /// we also keep track of whether there's an adjustment in
 /// our key.
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub struct MethodCall {
     pub expr_id: ast::NodeId,
     pub adjustment: ExprAdjustment
 }
 
-#[derive(Clone, PartialEq, Eq, Hash, Show, RustcEncodable, RustcDecodable, Copy)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug, RustcEncodable, RustcDecodable, Copy)]
 pub enum ExprAdjustment {
     NoAdjustment,
     AutoDeref(uint),
@@ -923,7 +923,7 @@ impl<'tcx> ctxt<'tcx> {
     }
 }
 
-#[derive(Show)]
+#[derive(Debug)]
 pub struct TyS<'tcx> {
     pub sty: sty<'tcx>,
     pub flags: TypeFlags,
@@ -1029,21 +1029,21 @@ pub fn type_escapes_depth(ty: Ty, depth: u32) -> bool {
     ty.region_depth > depth
 }
 
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct BareFnTy<'tcx> {
     pub unsafety: ast::Unsafety,
     pub abi: abi::Abi,
     pub sig: PolyFnSig<'tcx>,
 }
 
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct ClosureTy<'tcx> {
     pub unsafety: ast::Unsafety,
     pub abi: abi::Abi,
     pub sig: PolyFnSig<'tcx>,
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub enum FnOutput<'tcx> {
     FnConverging(Ty<'tcx>),
     FnDiverging
@@ -1100,7 +1100,7 @@ impl<'tcx> PolyFnSig<'tcx> {
     }
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub struct ParamTy {
     pub space: subst::ParamSpace,
     pub idx: u32,
@@ -1146,7 +1146,7 @@ pub struct ParamTy {
 /// is the outer fn.
 ///
 /// [dbi]: http://en.wikipedia.org/wiki/De_Bruijn_index
-#[derive(Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Debug, Copy)]
 pub struct DebruijnIndex {
     // We maintain the invariant that this is never 0. So 1 indicates
     // the innermost binder. To ensure this, create with `DebruijnIndex::new`.
@@ -1154,7 +1154,7 @@ pub struct DebruijnIndex {
 }
 
 /// Representation of regions:
-#[derive(Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Debug, Copy)]
 pub enum Region {
     // Region bound in a type or fn declaration which will be
     // substituted 'early' -- that is, at the same time when type
@@ -1195,13 +1195,13 @@ pub enum Region {
 /// Upvars do not get their own node-id. Instead, we use the pair of
 /// the original var id (that is, the root variable that is referenced
 /// by the upvar) and the id of the closure expression.
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub struct UpvarId {
     pub var_id: ast::NodeId,
     pub closure_expr_id: ast::NodeId,
 }
 
-#[derive(Clone, PartialEq, Eq, Hash, Show, RustcEncodable, RustcDecodable, Copy)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug, RustcEncodable, RustcDecodable, Copy)]
 pub enum BorrowKind {
     /// Data must be immutable and is aliasable.
     ImmBorrow,
@@ -1294,7 +1294,7 @@ pub enum BorrowKind {
 /// - Through mutation, the borrowed upvars can actually escape
 ///   the closure, so sometimes it is necessary for them to be larger
 ///   than the closure lifetime itself.
-#[derive(PartialEq, Clone, RustcEncodable, RustcDecodable, Show, Copy)]
+#[derive(PartialEq, Clone, RustcEncodable, RustcDecodable, Debug, Copy)]
 pub struct UpvarBorrow {
     pub kind: BorrowKind,
     pub region: ty::Region,
@@ -1320,7 +1320,7 @@ impl Region {
 }
 
 #[derive(Clone, PartialEq, PartialOrd, Eq, Ord, Hash,
-           RustcEncodable, RustcDecodable, Show, Copy)]
+           RustcEncodable, RustcDecodable, Debug, Copy)]
 /// A "free" region `fr` can be interpreted as "some region
 /// at least as big as the scope `fr.scope`".
 pub struct FreeRegion {
@@ -1329,7 +1329,7 @@ pub struct FreeRegion {
 }
 
 #[derive(Clone, PartialEq, PartialOrd, Eq, Ord, Hash,
-           RustcEncodable, RustcDecodable, Show, Copy)]
+           RustcEncodable, RustcDecodable, Debug, Copy)]
 pub enum BoundRegion {
     /// An anonymous region parameter for a given fn (&T)
     BrAnon(u32),
@@ -1350,7 +1350,7 @@ pub enum BoundRegion {
 
 // NB: If you change this, you'll probably want to change the corresponding
 // AST structure in libsyntax/ast.rs as well.
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub enum sty<'tcx> {
     ty_bool,
     ty_char,
@@ -1397,7 +1397,7 @@ pub enum sty<'tcx> {
             // on non-useful type error messages)
 }
 
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct TyTrait<'tcx> {
     pub principal: ty::PolyTraitRef<'tcx>,
     pub bounds: ExistentialBounds<'tcx>,
@@ -1469,7 +1469,7 @@ impl<'tcx> TyTrait<'tcx> {
 /// Note that a `TraitRef` introduces a level of region binding, to
 /// account for higher-ranked trait bounds like `T : for<'a> Foo<&'a
 /// U>` or higher-ranked object types.
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct TraitRef<'tcx> {
     pub def_id: DefId,
     pub substs: &'tcx Substs<'tcx>,
@@ -1509,7 +1509,7 @@ impl<'tcx> PolyTraitRef<'tcx> {
 /// erase, or otherwise "discharge" these bound reons, we change the
 /// type from `Binder<T>` to just `T` (see
 /// e.g. `liberate_late_bound_regions`).
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct Binder<T>(pub T);
 
 #[derive(Clone, Copy, PartialEq)]
@@ -1518,7 +1518,7 @@ pub enum IntVarValue {
     UintType(ast::UintTy),
 }
 
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 pub enum terr_vstore_kind {
     terr_vec,
     terr_str,
@@ -1526,14 +1526,14 @@ pub enum terr_vstore_kind {
     terr_trait
 }
 
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 pub struct expected_found<T> {
     pub expected: T,
     pub found: T
 }
 
 // Data structures used in type unification
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 pub enum type_err<'tcx> {
     terr_mismatch,
     terr_unsafety_mismatch(expected_found<ast::Unsafety>),
@@ -1567,7 +1567,7 @@ pub enum type_err<'tcx> {
 
 /// Bounds suitable for a named type parameter like `A` in `fn foo<A>`
 /// as well as the existential type parameter in an object type.
-#[derive(PartialEq, Eq, Hash, Clone, Show)]
+#[derive(PartialEq, Eq, Hash, Clone, Debug)]
 pub struct ParamBounds<'tcx> {
     pub region_bounds: Vec<ty::Region>,
     pub builtin_bounds: BuiltinBounds,
@@ -1580,7 +1580,7 @@ pub struct ParamBounds<'tcx> {
 /// major difference between this case and `ParamBounds` is that
 /// general purpose trait bounds are omitted and there must be
 /// *exactly one* region.
-#[derive(PartialEq, Eq, Hash, Clone, Show)]
+#[derive(PartialEq, Eq, Hash, Clone, Debug)]
 pub struct ExistentialBounds<'tcx> {
     pub region_bound: ty::Region,
     pub builtin_bounds: BuiltinBounds,
@@ -1590,7 +1590,7 @@ pub struct ExistentialBounds<'tcx> {
 pub type BuiltinBounds = EnumSet<BuiltinBound>;
 
 #[derive(Clone, RustcEncodable, PartialEq, Eq, RustcDecodable, Hash,
-           Show, Copy)]
+           Debug, Copy)]
 #[repr(uint)]
 pub enum BuiltinBound {
     BoundSend,
@@ -1664,7 +1664,7 @@ pub enum InferTy {
     FreshIntTy(u32),
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show, Copy)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Debug, Copy)]
 pub enum UnconstrainedNumeric {
     UnconstrainedFloat,
     UnconstrainedInt,
@@ -1672,7 +1672,7 @@ pub enum UnconstrainedNumeric {
 }
 
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Eq, Hash, Show, Copy)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Eq, Hash, Debug, Copy)]
 pub enum InferRegion {
     ReVar(RegionVid),
     ReSkolemized(u32, BoundRegion)
@@ -1746,7 +1746,7 @@ impl fmt::Debug for IntVarValue {
     }
 }
 
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct TypeParameterDef<'tcx> {
     pub name: ast::Name,
     pub def_id: ast::DefId,
@@ -1756,7 +1756,7 @@ pub struct TypeParameterDef<'tcx> {
     pub default: Option<Ty<'tcx>>,
 }
 
-#[derive(RustcEncodable, RustcDecodable, Clone, Show)]
+#[derive(RustcEncodable, RustcDecodable, Clone, Debug)]
 pub struct RegionParameterDef {
     pub name: ast::Name,
     pub def_id: ast::DefId,
@@ -1773,7 +1773,7 @@ impl RegionParameterDef {
 
 /// Information about the formal type/lifetime parameters associated
 /// with an item or method. Analogous to ast::Generics.
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct Generics<'tcx> {
     pub types: VecPerParamSpace<TypeParameterDef<'tcx>>,
     pub regions: VecPerParamSpace<RegionParameterDef>,
@@ -1809,7 +1809,7 @@ impl<'tcx> Generics<'tcx> {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub enum Predicate<'tcx> {
     /// Corresponds to `where Foo : Bar<A,B,C>`. `Foo` here would be
     /// the `Self` type of the trait reference and `A`, `B`, and `C`
@@ -1830,7 +1830,7 @@ pub enum Predicate<'tcx> {
     Projection(PolyProjectionPredicate<'tcx>),
 }
 
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct TraitPredicate<'tcx> {
     pub trait_ref: Rc<TraitRef<'tcx>>
 }
@@ -1856,11 +1856,11 @@ impl<'tcx> PolyTraitPredicate<'tcx> {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct EquatePredicate<'tcx>(pub Ty<'tcx>, pub Ty<'tcx>); // `0 == 1`
 pub type PolyEquatePredicate<'tcx> = ty::Binder<EquatePredicate<'tcx>>;
 
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct OutlivesPredicate<A,B>(pub A, pub B); // `A : B`
 pub type PolyOutlivesPredicate<A,B> = ty::Binder<OutlivesPredicate<A,B>>;
 pub type PolyRegionOutlivesPredicate = PolyOutlivesPredicate<ty::Region, ty::Region>;
@@ -1878,7 +1878,7 @@ pub type PolyTypeOutlivesPredicate<'tcx> = PolyOutlivesPredicate<Ty<'tcx>, ty::R
 /// equality between arbitrary types. Processing an instance of Form
 /// #2 eventually yields one of these `ProjectionPredicate`
 /// instances to normalize the LHS.
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct ProjectionPredicate<'tcx> {
     pub projection_ty: ProjectionTy<'tcx>,
     pub ty: Ty<'tcx>,
@@ -1898,7 +1898,7 @@ impl<'tcx> PolyProjectionPredicate<'tcx> {
 
 /// Represents the projection of an associated type. In explicit UFCS
 /// form this would be written `<T as Trait<..>>::N`.
-#[derive(Clone, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct ProjectionTy<'tcx> {
     /// The trait reference `T as Trait<..>`.
     pub trait_ref: Rc<ty::TraitRef<'tcx>>,
@@ -2034,7 +2034,7 @@ impl<'tcx> Predicate<'tcx> {
 /// `[[], [U:Bar<T>]]`.  Now if there were some particular reference
 /// like `Foo<int,uint>`, then the `GenericBounds` would be `[[],
 /// [uint:Bar<int>]]`.
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct GenericBounds<'tcx> {
     pub predicates: VecPerParamSpace<Predicate<'tcx>>,
 }
@@ -2243,7 +2243,7 @@ impl<'a, 'tcx> ParameterEnvironment<'a, 'tcx> {
 /// stray references in a comment or something). We try to reserve the
 /// "poly" prefix to refer to higher-ranked things, as in
 /// `PolyTraitRef`.
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct TypeScheme<'tcx> {
     pub generics: Generics<'tcx>,
     pub ty: Ty<'tcx>
@@ -2286,7 +2286,7 @@ pub struct Closure<'tcx> {
     pub kind: ClosureKind,
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
 pub enum ClosureKind {
     FnClosureKind,
     FnMutClosureKind,
@@ -3745,7 +3745,7 @@ pub fn is_instantiable<'tcx>(cx: &ctxt<'tcx>, r_ty: Ty<'tcx>) -> bool {
 ///
 /// The ordering of the cases is significant. They are sorted so that cmp::max
 /// will keep the "more erroneous" of two values.
-#[derive(Copy, PartialOrd, Ord, Eq, PartialEq, Show)]
+#[derive(Copy, PartialOrd, Ord, Eq, PartialEq, Debug)]
 pub enum Representability {
     Representable,
     ContainsRecursive,
@@ -6536,7 +6536,7 @@ impl<'a,'tcx> ClosureTyper<'tcx> for ty::ParameterEnvironment<'a,'tcx> {
 
 
 /// The category of explicit self.
-#[derive(Clone, Copy, Eq, PartialEq, Show)]
+#[derive(Clone, Copy, Eq, PartialEq, Debug)]
 pub enum ExplicitSelfCategory {
     StaticExplicitSelfCategory,
     ByValueExplicitSelfCategory,

src/librustc/session/config.rs

@@ -249,7 +249,7 @@ pub enum EntryFnType {
     EntryNone,
 }
 
-#[derive(Copy, PartialEq, PartialOrd, Clone, Ord, Eq, Hash, Show)]
+#[derive(Copy, PartialEq, PartialOrd, Clone, Ord, Eq, Hash, Debug)]
 pub enum CrateType {
     CrateTypeExecutable,
     CrateTypeDylib,
@@ -672,7 +672,7 @@ pub fn optgroups() -> Vec<getopts::OptGroup> {
         .collect()
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, Show)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub enum OptionStability { Stable, Unstable }
 
 #[derive(Clone, PartialEq, Eq)]

src/librustc/session/search_paths.rs

@@ -10,7 +10,7 @@
 
 use std::slice;
 
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct SearchPaths {
     paths: Vec<(PathKind, Path)>,
 }
@@ -20,7 +20,7 @@ pub struct Iter<'a> {
     iter: slice::Iter<'a, (PathKind, Path)>,
 }
 
-#[derive(Eq, PartialEq, Clone, Copy, Show)]
+#[derive(Eq, PartialEq, Clone, Copy, Debug)]
 pub enum PathKind {
     Native,
     Crate,

src/librustc/util/common.rs

@@ -27,7 +27,7 @@ pub const FN_OUTPUT_NAME: &'static str = "Output";
 
 // Useful type to use with `Result<>` indicate that an error has already
 // been reported to the user, so no need to continue checking.
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 pub struct ErrorReported;
 
 pub fn time<T, U, F>(do_it: bool, what: &str, u: U, f: F) -> T where

src/librustc_back/svh.rs

@@ -52,7 +52,7 @@ use std::iter::range_step;
 use syntax::ast;
 use syntax::visit;
 
-#[derive(Clone, PartialEq, Show)]
+#[derive(Clone, PartialEq, Debug)]
 pub struct Svh {
     hash: String,
 }

src/librustc_back/target/mod.rs

@@ -84,7 +84,7 @@ mod x86_64_unknown_linux_gnu;
 /// Everything `rustc` knows about how to compile for a specific target.
 ///
 /// Every field here must be specified, and has no default value.
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct Target {
     /// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
     pub data_layout: String,
@@ -107,7 +107,7 @@ pub struct Target {
 ///
 /// This has an implementation of `Default`, see each field for what the default is. In general,
 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct TargetOptions {
     /// Linker to invoke. Defaults to "cc".
     pub linker: String,

src/librustc_bitflags/lib.rs

@@ -73,7 +73,7 @@
 ///     }
 /// }
 ///
-/// impl fmt::Show for Flags {
+/// impl fmt::Debug for Flags {
 ///     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 ///         write!(f, "hi!")
 ///     }

src/librustc_borrowck/borrowck/gather_loans/restrictions.rs

@@ -21,7 +21,7 @@ use syntax::codemap::Span;
 
 use std::rc::Rc;
 
-#[derive(Show)]
+#[derive(Debug)]
 pub enum RestrictionResult<'tcx> {
     Safe,
     SafeIf(Rc<LoanPath<'tcx>>, Vec<Rc<LoanPath<'tcx>>>)

src/librustc_borrowck/borrowck/mod.rs

@@ -278,7 +278,7 @@ impl<'tcx> Loan<'tcx> {
     }
 }
 
-#[derive(Eq, Hash, Show)]
+#[derive(Eq, Hash, Debug)]
 pub struct LoanPath<'tcx> {
     kind: LoanPathKind<'tcx>,
     ty: ty::Ty<'tcx>,
@@ -293,7 +293,7 @@ impl<'tcx> PartialEq for LoanPath<'tcx> {
     }
 }
 
-#[derive(PartialEq, Eq, Hash, Show)]
+#[derive(PartialEq, Eq, Hash, Debug)]
 pub enum LoanPathKind<'tcx> {
     LpVar(ast::NodeId),                         // `x` in doc.rs
     LpUpvar(ty::UpvarId),                       // `x` captured by-value into closure
@@ -314,7 +314,7 @@ impl<'tcx> LoanPath<'tcx> {
 //     b2b39e8700e37ad32b486b9a8409b50a8a53aa51#commitcomment-7892003
 static DOWNCAST_PRINTED_OPERATOR : &'static str = " as ";
 
-#[derive(Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Copy, PartialEq, Eq, Hash, Debug)]
 pub enum LoanPathElem {
     LpDeref(mc::PointerKind),    // `*LV` in doc.rs
     LpInterior(mc::InteriorKind) // `LV.f` in doc.rs
@@ -487,7 +487,7 @@ pub enum AliasableViolationKind {
     BorrowViolation(euv::LoanCause)
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum MovedValueUseKind {
     MovedInUse,
     MovedInCapture,

src/librustc_borrowck/borrowck/move_data.rs

@@ -76,7 +76,7 @@ pub struct FlowedMoveData<'a, 'tcx: 'a> {
 }
 
 /// Index into `MoveData.paths`, used like a pointer
-#[derive(Copy, PartialEq, Eq, PartialOrd, Ord, Show)]
+#[derive(Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
 pub struct MovePathIndex(uint);
 
 impl MovePathIndex {
@@ -128,7 +128,7 @@ pub struct MovePath<'tcx> {
     pub next_sibling: MovePathIndex,
 }
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum MoveKind {
     Declared,   // When declared, variables start out "moved".
     MoveExpr,   // Expression or binding that moves a variable

src/librustc_borrowck/graphviz.rs

@@ -26,7 +26,7 @@ use rustc::middle::dataflow;
 use std::rc::Rc;
 use std::borrow::IntoCow;
 
-#[derive(Show, Copy)]
+#[derive(Debug, Copy)]
 pub enum Variant {
     Loans,
     Moves,

src/librustc_driver/pretty.rs

@@ -42,7 +42,7 @@ use std::old_io::{self, MemReader};
 use std::option;
 use std::str::FromStr;
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum PpSourceMode {
     PpmNormal,
     PpmEveryBodyLoops,
@@ -54,7 +54,7 @@ pub enum PpSourceMode {
 }
 
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum PpFlowGraphMode {
     Default,
     /// Drops the labels from the edges in the flowgraph output. This
@@ -63,7 +63,7 @@ pub enum PpFlowGraphMode {
     /// have become a pain to maintain.
     UnlabelledEdges,
 }
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum PpMode {
     PpmSource(PpSourceMode),
     PpmFlowGraph(PpFlowGraphMode),
@@ -338,7 +338,7 @@ fn gather_flowgraph_variants(sess: &Session) -> Vec<borrowck_dot::Variant> {
     variants
 }
 
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub enum UserIdentifiedItem {
     ItemViaNode(ast::NodeId),
     ItemViaPath(Vec<String>),

src/librustc_llvm/lib.rs

@@ -115,7 +115,7 @@ pub enum Linkage {
 }
 
 #[repr(C)]
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum DiagnosticSeverity {
     Error,
     Warning,
@@ -312,7 +312,7 @@ pub enum RealPredicate {
 
 // The LLVM TypeKind type - must stay in sync with the def of
 // LLVMTypeKind in llvm/include/llvm-c/Core.h
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 #[repr(C)]
 pub enum TypeKind {
     Void      = 0,

src/librustc_resolve/lib.rs

@@ -127,7 +127,7 @@ enum PatternBindingMode {
     ArgumentIrrefutableMode,
 }
 
-#[derive(Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Copy, PartialEq, Eq, Hash, Debug)]
 enum Namespace {
     TypeNS,
     ValueNS
@@ -193,7 +193,7 @@ impl<'a, 'v, 'tcx> Visitor<'v> for Resolver<'a, 'tcx> {
 }
 
 /// Contains data for specific types of import directives.
-#[derive(Copy,Show)]
+#[derive(Copy,Debug)]
 enum ImportDirectiveSubclass {
     SingleImport(Name /* target */, Name /* source */),
     GlobImport
@@ -242,7 +242,7 @@ enum TypeParameters<'a> {
 
 // The rib kind controls the translation of local
 // definitions (`DefLocal`) to upvars (`DefUpvar`).
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 enum RibKind {
     // No translation needs to be applied.
     NormalRibKind,
@@ -266,7 +266,7 @@ enum RibKind {
 }
 
 // Methods can be required or provided. RequiredMethod methods only occur in traits.
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 enum MethodSort {
     RequiredMethod,
     ProvidedMethod(NodeId)
@@ -301,7 +301,7 @@ enum BareIdentifierPatternResolution {
 }
 
 /// One local scope.
-#[derive(Show)]
+#[derive(Debug)]
 struct Rib {
     bindings: HashMap<Name, DefLike>,
     kind: RibKind,
@@ -317,14 +317,14 @@ impl Rib {
 }
 
 /// Whether an import can be shadowed by another import.
-#[derive(Show,PartialEq,Clone,Copy)]
+#[derive(Debug,PartialEq,Clone,Copy)]
 enum Shadowable {
     Always,
     Never
 }
 
 /// One import directive.
-#[derive(Show)]
+#[derive(Debug)]
 struct ImportDirective {
     module_path: Vec<Name>,
     subclass: ImportDirectiveSubclass,
@@ -354,7 +354,7 @@ impl ImportDirective {
 }
 
 /// The item that an import resolves to.
-#[derive(Clone,Show)]
+#[derive(Clone,Debug)]
 struct Target {
     target_module: Rc<Module>,
     bindings: Rc<NameBindings>,
@@ -375,7 +375,7 @@ impl Target {
 }
 
 /// An ImportResolution represents a particular `use` directive.
-#[derive(Show)]
+#[derive(Debug)]
 struct ImportResolution {
     /// Whether this resolution came from a `use` or a `pub use`. Note that this
     /// should *not* be used whenever resolution is being performed, this is
@@ -455,7 +455,7 @@ impl ImportResolution {
 }
 
 /// The link from a module up to its nearest parent node.
-#[derive(Clone,Show)]
+#[derive(Clone,Debug)]
 enum ParentLink {
     NoParentLink,
     ModuleParentLink(Weak<Module>, Name),
@@ -463,7 +463,7 @@ enum ParentLink {
 }
 
 /// The type of module this is.
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 enum ModuleKind {
     NormalModuleKind,
     TraitModuleKind,
@@ -556,7 +556,7 @@ impl fmt::Debug for Module {
 }
 
 bitflags! {
-    #[derive(Show)]
+    #[derive(Debug)]
     flags DefModifiers: u8 {
         const PUBLIC            = 0b0000_0001,
         const IMPORTABLE        = 0b0000_0010,
@@ -564,7 +564,7 @@ bitflags! {
 }
 
 // Records a possibly-private type definition.
-#[derive(Clone,Show)]
+#[derive(Clone,Debug)]
 struct TypeNsDef {
     modifiers: DefModifiers, // see note in ImportResolution about how to use this
     module_def: Option<Rc<Module>>,
@@ -573,7 +573,7 @@ struct TypeNsDef {
 }
 
 // Records a possibly-private value definition.
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 struct ValueNsDef {
     modifiers: DefModifiers, // see note in ImportResolution about how to use this
     def: Def,
@@ -582,7 +582,7 @@ struct ValueNsDef {
 
 // Records the definitions (at most one for each namespace) that a name is
 // bound to.
-#[derive(Show)]
+#[derive(Debug)]
 struct NameBindings {
     type_def: RefCell<Option<TypeNsDef>>,   //< Meaning in type namespace.
     value_def: RefCell<Option<ValueNsDef>>, //< Meaning in value namespace.

src/librustc_trans/save/recorder.rs

@@ -63,7 +63,7 @@ macro_rules! svec {
     })
 }
 
-#[derive(Copy,Show)]
+#[derive(Copy,Debug)]
 pub enum Row {
     Variable,
     Enum,

src/librustc_trans/trans/_match.rs

@@ -227,7 +227,7 @@ use syntax::codemap::Span;
 use syntax::fold::Folder;
 use syntax::ptr::P;
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 struct ConstantExpr<'a>(&'a ast::Expr);
 
 impl<'a> ConstantExpr<'a> {
@@ -242,7 +242,7 @@ impl<'a> ConstantExpr<'a> {
 }
 
 // An option identifying a branch (either a literal, an enum variant or a range)
-#[derive(Show)]
+#[derive(Debug)]
 enum Opt<'a, 'tcx> {
     ConstantValue(ConstantExpr<'a>),
     ConstantRange(ConstantExpr<'a>, ConstantExpr<'a>),

src/librustc_trans/trans/adt.rs

@@ -72,7 +72,7 @@ use util::ppaux::ty_to_string;
 type Hint = attr::ReprAttr;
 
 /// Representations.
-#[derive(Eq, PartialEq, Show)]
+#[derive(Eq, PartialEq, Debug)]
 pub enum Repr<'tcx> {
     /// C-like enums; basically an int.
     CEnum(IntType, Disr, Disr), // discriminant range (signedness based on the IntType)
@@ -117,7 +117,7 @@ pub enum Repr<'tcx> {
 }
 
 /// For structs, and struct-like parts of anything fancier.
-#[derive(Eq, PartialEq, Show)]
+#[derive(Eq, PartialEq, Debug)]
 pub struct Struct<'tcx> {
     // If the struct is DST, then the size and alignment do not take into
     // account the unsized fields of the struct.
@@ -465,7 +465,7 @@ fn mk_struct<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
     }
 }
 
-#[derive(Show)]
+#[derive(Debug)]
 struct IntBounds {
     slo: i64,
     shi: i64,

src/librustc_trans/trans/cleanup.rs

@@ -50,7 +50,7 @@ pub struct CleanupScope<'blk, 'tcx: 'blk> {
     cached_landing_pad: Option<BasicBlockRef>,
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub struct CustomScopeIndex {
     index: uint
 }
@@ -81,7 +81,7 @@ impl<'blk, 'tcx: 'blk> fmt::Debug for CleanupScopeKind<'blk, 'tcx> {
     }
 }
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum EarlyExitLabel {
     UnwindExit,
     ReturnExit,
@@ -106,7 +106,7 @@ pub trait Cleanup<'tcx> {
 
 pub type CleanupObj<'tcx> = Box<Cleanup<'tcx>+'tcx>;
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum ScopeId {
     AstScope(ast::NodeId),
     CustomScope(CustomScopeIndex)
@@ -911,7 +911,7 @@ impl<'tcx> Cleanup<'tcx> for DropValue<'tcx> {
     }
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum Heap {
     HeapExchange
 }

src/librustc_trans/trans/common.rs

@@ -1137,7 +1137,7 @@ pub fn drain_fulfillment_cx<'a,'tcx,T>(span: Span,
 }
 
 // Key used to lookup values supplied for type parameters in an expr.
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum ExprOrMethodCall {
     // Type parameters for a path like `None::<int>`
     ExprId(ast::NodeId),

src/librustc_trans/trans/datum.rs

@@ -52,7 +52,7 @@ pub struct DatumBlock<'blk, 'tcx: 'blk, K> {
     pub datum: Datum<'tcx, K>,
 }
 
-#[derive(Show)]
+#[derive(Debug)]
 pub enum Expr {
     /// a fresh value that was produced and which has no cleanup yet
     /// because it has not yet "landed" into its permanent home
@@ -64,10 +64,10 @@ pub enum Expr {
     LvalueExpr,
 }
 
-#[derive(Clone, Copy, Show)]
+#[derive(Clone, Copy, Debug)]
 pub struct Lvalue;
 
-#[derive(Show)]
+#[derive(Debug)]
 pub struct Rvalue {
     pub mode: RvalueMode
 }
@@ -83,7 +83,7 @@ impl Drop for Rvalue {
     fn drop(&mut self) { }
 }
 
-#[derive(Copy, PartialEq, Eq, Hash, Show)]
+#[derive(Copy, PartialEq, Eq, Hash, Debug)]
 pub enum RvalueMode {
     /// `val` is a pointer to the actual value (and thus has type *T)
     ByRef,

src/librustc_trans/trans/debuginfo.rs

@@ -249,7 +249,7 @@ const FLAGS_NONE: c_uint = 0;
 //  Public Interface of debuginfo module
 //=-----------------------------------------------------------------------------
 
-#[derive(Copy, Show, Hash, Eq, PartialEq, Clone)]
+#[derive(Copy, Debug, Hash, Eq, PartialEq, Clone)]
 struct UniqueTypeId(ast::Name);
 
 // The TypeMap is where the CrateDebugContext holds the type metadata nodes

src/librustc_trans/trans/expr.rs

@@ -1924,7 +1924,7 @@ fn float_cast(bcx: Block,
     } else { llsrc };
 }
 
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum cast_kind {
     cast_pointer,
     cast_integral,

src/librustc_trans/trans/monomorphize.rs

@@ -286,7 +286,7 @@ pub fn monomorphic_fn<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
     (lldecl, mono_ty, true)
 }
 
-#[derive(PartialEq, Eq, Hash, Show)]
+#[derive(PartialEq, Eq, Hash, Debug)]
 pub struct MonoId<'tcx> {
     pub def: ast::DefId,
     pub params: subst::VecPerParamSpace<Ty<'tcx>>

src/librustc_trans/trans/type_.rs

@@ -27,7 +27,7 @@ use std::iter::repeat;
 
 use libc::c_uint;
 
-#[derive(Clone, Copy, PartialEq, Show)]
+#[derive(Clone, Copy, PartialEq, Debug)]
 #[repr(C)]
 pub struct Type {
     rf: TypeRef

src/librustc_typeck/check/method/probe.rs

@@ -73,7 +73,7 @@ pub struct Pick<'tcx> {
     pub kind: PickKind<'tcx>,
 }
 
-#[derive(Clone,Show)]
+#[derive(Clone,Debug)]
 pub enum PickKind<'tcx> {
     InherentImplPick(/* Impl */ ast::DefId),
     ObjectPick(/* Trait */ ast::DefId, /* method_num */ uint, /* real_index */ uint),
@@ -88,7 +88,7 @@ pub type PickResult<'tcx> = Result<Pick<'tcx>, MethodError>;
 // difference is that it doesn't embed any regions or other
 // specifics. The "confirmation" step recreates those details as
 // needed.
-#[derive(Clone,Show)]
+#[derive(Clone,Debug)]
 pub enum PickAdjustment {
     // Indicates that the source expression should be autoderef'd N times
     //

src/librustc_typeck/check/mod.rs

@@ -1877,7 +1877,7 @@ impl<'a, 'tcx> RegionScope for FnCtxt<'a, 'tcx> {
     }
 }
 
-#[derive(Copy, Show, PartialEq, Eq)]
+#[derive(Copy, Debug, PartialEq, Eq)]
 pub enum LvaluePreference {
     PreferMutLvalue,
     NoPreference

src/librustc_typeck/variance.rs

@@ -230,7 +230,7 @@ pub fn infer_variance(tcx: &ty::ctxt) {
 
 type VarianceTermPtr<'a> = &'a VarianceTerm<'a>;
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 struct InferredIndex(uint);
 
 #[derive(Copy)]
@@ -266,7 +266,7 @@ struct TermsContext<'a, 'tcx: 'a> {
     inferred_infos: Vec<InferredInfo<'a>> ,
 }
 
-#[derive(Copy, Show, PartialEq)]
+#[derive(Copy, Debug, PartialEq)]
 enum ParamKind {
     TypeParam,
     RegionParam

src/librustdoc/clean/mod.rs

@@ -115,7 +115,7 @@ impl<T: Clean<U>, U> Clean<Vec<U>> for syntax::owned_slice::OwnedSlice<T> {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Crate {
     pub name: String,
     pub src: FsPath,
@@ -204,7 +204,7 @@ impl<'a, 'tcx> Clean<Crate> for visit_ast::RustdocVisitor<'a, 'tcx> {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct ExternalCrate {
     pub name: String,
     pub attrs: Vec<Attribute>,
@@ -237,7 +237,7 @@ impl Clean<ExternalCrate> for cstore::crate_metadata {
 /// Anything with a source location and set of attributes and, optionally, a
 /// name. That is, anything that can be documented. This doesn't correspond
 /// directly to the AST's concept of an item; it's a strict superset.
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Item {
     /// Stringified span
     pub source: Span,
@@ -313,7 +313,7 @@ impl Item {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub enum ItemEnum {
     ExternCrateItem(String, Option<String>),
     ImportItem(Import),
@@ -342,7 +342,7 @@ pub enum ItemEnum {
     AssociatedTypeItem(TyParam),
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Module {
     pub items: Vec<Item>,
     pub is_crate: bool,
@@ -401,7 +401,7 @@ impl Clean<Item> for doctree::Module {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub enum Attribute {
     Word(String),
     List(String, Vec<Attribute> ),
@@ -456,7 +456,7 @@ impl<'a> attr::AttrMetaMethods for &'a Attribute {
     fn span(&self) -> codemap::Span { unimplemented!() }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub struct TyParam {
     pub name: String,
     pub did: ast::DefId,
@@ -489,7 +489,7 @@ impl<'tcx> Clean<TyParam> for ty::TypeParameterDef<'tcx> {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub enum TyParamBound {
     RegionBound(Lifetime),
     TraitBound(PolyTrait, ast::TraitBoundModifier)
@@ -684,7 +684,7 @@ impl<'tcx> Clean<Option<Vec<TyParamBound>>> for subst::Substs<'tcx> {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub struct Lifetime(String);
 
 impl Lifetime {
@@ -734,7 +734,7 @@ impl Clean<Option<Lifetime>> for ty::Region {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub enum WherePredicate {
     BoundPredicate { ty: Type, bounds: Vec<TyParamBound> },
     RegionPredicate { lifetime: Lifetime, bounds: Vec<Lifetime>},
@@ -843,7 +843,7 @@ impl<'tcx> Clean<Type> for ty::ProjectionTy<'tcx> {
 }
 
 // maybe use a Generic enum and use ~[Generic]?
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub struct Generics {
     pub lifetimes: Vec<Lifetime>,
     pub type_params: Vec<TyParam>,
@@ -940,7 +940,7 @@ impl<'a, 'tcx> Clean<Generics> for (&'a ty::Generics<'tcx>, subst::ParamSpace) {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Method {
     pub generics: Generics,
     pub self_: SelfTy,
@@ -979,7 +979,7 @@ impl Clean<Item> for ast::Method {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct TyMethod {
     pub unsafety: ast::Unsafety,
     pub decl: FnDecl,
@@ -1017,7 +1017,7 @@ impl Clean<Item> for ast::TypeMethod {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub enum SelfTy {
     SelfStatic,
     SelfValue,
@@ -1038,7 +1038,7 @@ impl Clean<SelfTy> for ast::ExplicitSelf_ {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Function {
     pub decl: FnDecl,
     pub generics: Generics,
@@ -1063,14 +1063,14 @@ impl Clean<Item> for doctree::Function {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub struct FnDecl {
     pub inputs: Arguments,
     pub output: FunctionRetTy,
     pub attrs: Vec<Attribute>,
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub struct Arguments {
     pub values: Vec<Argument>,
 }
@@ -1123,7 +1123,7 @@ impl<'a, 'tcx> Clean<FnDecl> for (ast::DefId, &'a ty::PolyFnSig<'tcx>) {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub struct Argument {
     pub type_: Type,
     pub name: String,
@@ -1140,7 +1140,7 @@ impl Clean<Argument> for ast::Arg {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub enum FunctionRetTy {
     Return(Type),
     DefaultReturn,
@@ -1157,7 +1157,7 @@ impl Clean<FunctionRetTy> for ast::FunctionRetTy {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Trait {
     pub unsafety: ast::Unsafety,
     pub items: Vec<TraitMethod>,
@@ -1201,7 +1201,7 @@ impl Clean<PolyTrait> for ast::PolyTraitRef {
 
 /// An item belonging to a trait, whether a method or associated. Could be named
 /// TraitItem except that's already taken by an exported enum variant.
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub enum TraitMethod {
     RequiredMethod(Item),
     ProvidedMethod(Item),
@@ -1246,7 +1246,7 @@ impl Clean<TraitMethod> for ast::TraitItem {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub enum ImplMethod {
     MethodImplItem(Item),
     TypeImplItem(Item),
@@ -1317,7 +1317,7 @@ impl<'tcx> Clean<Item> for ty::ImplOrTraitItem<'tcx> {
 }
 
 /// A trait reference, which may have higher ranked lifetimes.
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub struct PolyTrait {
     pub trait_: Type,
     pub lifetimes: Vec<Lifetime>
@@ -1326,7 +1326,7 @@ pub struct PolyTrait {
 /// A representation of a Type suitable for hyperlinking purposes. Ideally one can get the original
 /// type out of the AST/ty::ctxt given one of these, if more information is needed. Most importantly
 /// it does not preserve mutability or boxes.
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub enum Type {
     /// structs/enums/traits (anything that'd be an ast::TyPath)
     ResolvedPath {
@@ -1370,7 +1370,7 @@ pub enum Type {
     PolyTraitRef(Vec<TyParamBound>),
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Copy, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Copy, Debug)]
 pub enum PrimitiveType {
     Isize, I8, I16, I32, I64,
     Usize, U8, U16, U32, U64,
@@ -1382,7 +1382,7 @@ pub enum PrimitiveType {
     PrimitiveTuple,
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Copy, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Copy, Debug)]
 pub enum TypeKind {
     TypeEnum,
     TypeFunction,
@@ -1625,7 +1625,7 @@ impl Clean<Type> for ast::QPath {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub enum StructField {
     HiddenStructField, // inserted later by strip passes
     TypedStructField(Type),
@@ -1684,7 +1684,7 @@ impl Clean<Option<Visibility>> for ast::Visibility {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Struct {
     pub struct_type: doctree::StructType,
     pub generics: Generics,
@@ -1714,7 +1714,7 @@ impl Clean<Item> for doctree::Struct {
 /// This is a more limited form of the standard Struct, different in that
 /// it lacks the things most items have (name, id, parameterization). Found
 /// only as a variant in an enum.
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct VariantStruct {
     pub struct_type: doctree::StructType,
     pub fields: Vec<Item>,
@@ -1731,7 +1731,7 @@ impl Clean<VariantStruct> for syntax::ast::StructDef {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Enum {
     pub variants: Vec<Item>,
     pub generics: Generics,
@@ -1756,7 +1756,7 @@ impl Clean<Item> for doctree::Enum {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Variant {
     pub kind: VariantKind,
 }
@@ -1824,7 +1824,7 @@ impl<'tcx> Clean<Item> for ty::VariantInfo<'tcx> {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub enum VariantKind {
     CLikeVariant,
     TupleVariant(Vec<Type>),
@@ -1846,7 +1846,7 @@ impl Clean<VariantKind> for ast::VariantKind {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Span {
     pub filename: String,
     pub loline: uint,
@@ -1881,7 +1881,7 @@ impl Clean<Span> for syntax::codemap::Span {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub struct Path {
     pub global: bool,
     pub segments: Vec<PathSegment>,
@@ -1896,7 +1896,7 @@ impl Clean<Path> for ast::Path {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub enum PathParameters {
     AngleBracketed {
         lifetimes: Vec<Lifetime>,
@@ -1930,7 +1930,7 @@ impl Clean<PathParameters> for ast::PathParameters {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub struct PathSegment {
     pub name: String,
     pub params: PathParameters
@@ -1971,7 +1971,7 @@ impl Clean<String> for ast::Name {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Typedef {
     pub type_: Type,
     pub generics: Generics,
@@ -1994,7 +1994,7 @@ impl Clean<Item> for doctree::Typedef {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
 pub struct BareFunctionDecl {
     pub unsafety: ast::Unsafety,
     pub generics: Generics,
@@ -2017,7 +2017,7 @@ impl Clean<BareFunctionDecl> for ast::BareFnTy {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Static {
     pub type_: Type,
     pub mutability: Mutability,
@@ -2046,7 +2046,7 @@ impl Clean<Item> for doctree::Static {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Constant {
     pub type_: Type,
     pub expr: String,
@@ -2069,7 +2069,7 @@ impl Clean<Item> for doctree::Constant {
     }
 }
 
-#[derive(Show, Clone, RustcEncodable, RustcDecodable, PartialEq, Copy)]
+#[derive(Debug, Clone, RustcEncodable, RustcDecodable, PartialEq, Copy)]
 pub enum Mutability {
     Mutable,
     Immutable,
@@ -2084,7 +2084,7 @@ impl Clean<Mutability> for ast::Mutability {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Copy, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Copy, Debug)]
 pub enum ImplPolarity {
     Positive,
     Negative,
@@ -2099,7 +2099,7 @@ impl Clean<ImplPolarity> for ast::ImplPolarity {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Impl {
     pub generics: Generics,
     pub trait_: Option<Type>,
@@ -2219,7 +2219,7 @@ impl Clean<Vec<Item>> for doctree::Import {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub enum Import {
     // use source as str;
     SimpleImport(String, ImportSource),
@@ -2229,13 +2229,13 @@ pub enum Import {
     ImportList(ImportSource, Vec<ViewListIdent>),
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct ImportSource {
     pub path: Path,
     pub did: Option<ast::DefId>,
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct ViewListIdent {
     pub name: String,
     pub source: Option<ast::DefId>,
@@ -2454,7 +2454,7 @@ fn resolve_def(cx: &DocContext, id: ast::NodeId) -> Option<ast::DefId> {
     })
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Macro {
     pub source: String,
 }
@@ -2475,7 +2475,7 @@ impl Clean<Item> for doctree::Macro {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Stability {
     pub level: attr::StabilityLevel,
     pub feature: String,
@@ -2595,7 +2595,7 @@ fn lang_struct(cx: &DocContext, did: Option<ast::DefId>,
 }
 
 /// An equality constraint on an associated type, e.g. `A=Bar` in `Foo<A=Bar>`
-#[derive(Clone, PartialEq, RustcDecodable, RustcEncodable, Show)]
+#[derive(Clone, PartialEq, RustcDecodable, RustcEncodable, Debug)]
 pub struct TypeBinding {
     pub name: String,
     pub ty: Type

src/librustdoc/doctree.rs

@@ -72,7 +72,7 @@ impl Module {
     }
 }
 
-#[derive(Show, Clone, RustcEncodable, RustcDecodable, Copy)]
+#[derive(Debug, Clone, RustcEncodable, RustcDecodable, Copy)]
 pub enum StructType {
     /// A normal struct
     Plain,
@@ -145,7 +145,7 @@ pub struct Typedef {
     pub stab: Option<attr::Stability>,
 }
 
-#[derive(Show)]
+#[derive(Debug)]
 pub struct Static {
     pub type_: P<ast::Ty>,
     pub mutability: ast::Mutability,

src/librustdoc/html/markdown.rs

@@ -395,7 +395,7 @@ pub fn find_testable_code(doc: &str, tests: &mut ::test::Collector) {
     }
 }
 
-#[derive(Eq, PartialEq, Clone, Show)]
+#[derive(Eq, PartialEq, Clone, Debug)]
 struct LangString {
     should_fail: bool,
     no_run: bool,

src/libserialize/hex.rs

@@ -61,7 +61,7 @@ pub trait FromHex {
 }
 
 /// Errors that can occur when decoding a hex encoded string
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum FromHexError {
     /// The input contained a character not part of the hex format
     InvalidHexCharacter(char, uint),

src/libserialize/json.rs

@@ -214,7 +214,7 @@ use unicode::str::Utf16Item;
 use Encodable;
 
 /// Represents a json value
-#[derive(Clone, PartialEq, PartialOrd, Show)]
+#[derive(Clone, PartialEq, PartialOrd, Debug)]
 pub enum Json {
     I64(i64),
     U64(u64),
@@ -235,7 +235,7 @@ pub struct AsJson<'a, T: 'a> { inner: &'a T }
 pub struct AsPrettyJson<'a, T: 'a> { inner: &'a T, indent: Option<uint> }
 
 /// The errors that can arise while parsing a JSON stream.
-#[derive(Clone, Copy, PartialEq, Show)]
+#[derive(Clone, Copy, PartialEq, Debug)]
 pub enum ErrorCode {
     InvalidSyntax,
     InvalidNumber,
@@ -256,7 +256,7 @@ pub enum ErrorCode {
     NotUtf8,
 }
 
-#[derive(Clone, Copy, PartialEq, Show)]
+#[derive(Clone, Copy, PartialEq, Debug)]
 pub enum ParserError {
     /// msg, line, col
     SyntaxError(ErrorCode, uint, uint),
@@ -266,7 +266,7 @@ pub enum ParserError {
 // Builder and Parser have the same errors.
 pub type BuilderError = ParserError;
 
-#[derive(Clone, PartialEq, Show)]
+#[derive(Clone, PartialEq, Debug)]
 pub enum DecoderError {
     ParseError(ParserError),
     ExpectedError(string::String, string::String),
@@ -275,7 +275,7 @@ pub enum DecoderError {
     ApplicationError(string::String)
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum EncoderError {
     FmtError(fmt::Error),
     BadHashmapKey,
@@ -1239,7 +1239,7 @@ impl Index<uint> for Json {
 }
 
 /// The output of the streaming parser.
-#[derive(PartialEq, Clone, Show)]
+#[derive(PartialEq, Clone, Debug)]
 pub enum JsonEvent {
     ObjectStart,
     ObjectEnd,
@@ -1254,7 +1254,7 @@ pub enum JsonEvent {
     Error(ParserError),
 }
 
-#[derive(PartialEq, Show)]
+#[derive(PartialEq, Debug)]
 enum ParserState {
     // Parse a value in an array, true means first element.
     ParseArray(bool),
@@ -1284,7 +1284,7 @@ pub struct Stack {
 /// For example, StackElement::Key("foo"), StackElement::Key("bar"),
 /// StackElement::Index(3) and StackElement::Key("x") are the
 /// StackElements compositing the stack that represents foo.bar[3].x
-#[derive(PartialEq, Clone, Show)]
+#[derive(PartialEq, Clone, Debug)]
 pub enum StackElement<'l> {
     Index(u32),
     Key(&'l str),
@@ -1292,7 +1292,7 @@ pub enum StackElement<'l> {
 
 // Internally, Key elements are stored as indices in a buffer to avoid
 // allocating a string for every member of an object.
-#[derive(PartialEq, Clone, Show)]
+#[derive(PartialEq, Clone, Debug)]
 enum InternalStackElement {
     InternalIndex(u32),
     InternalKey(u16, u16), // start, size
@@ -2623,7 +2623,7 @@ mod tests {
     use std::num::Float;
     use std::string;
 
-    #[derive(RustcDecodable, Eq, PartialEq, Show)]
+    #[derive(RustcDecodable, Eq, PartialEq, Debug)]
     struct OptionData {
         opt: Option<uint>,
     }
@@ -2650,20 +2650,20 @@ mod tests {
                                 ExpectedError("Number".to_string(), "false".to_string()));
     }
 
-    #[derive(PartialEq, RustcEncodable, RustcDecodable, Show)]
+    #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
     enum Animal {
         Dog,
         Frog(string::String, int)
     }
 
-    #[derive(PartialEq, RustcEncodable, RustcDecodable, Show)]
+    #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
     struct Inner {
         a: (),
         b: uint,
         c: Vec<string::String>,
     }
 
-    #[derive(PartialEq, RustcEncodable, RustcDecodable, Show)]
+    #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
     struct Outer {
         inner: Vec<Inner>,
     }

src/libstd/num/mod.rs

@@ -951,7 +951,7 @@ mod tests {
     test_checked_next_power_of_two! { test_checked_next_power_of_two_u64, u64 }
     test_checked_next_power_of_two! { test_checked_next_power_of_two_uint, uint }
 
-    #[derive(PartialEq, Show)]
+    #[derive(PartialEq, Debug)]
     struct Value { x: int }
 
     impl ToPrimitive for Value {

src/libstd/old_io/mod.rs

@@ -320,7 +320,7 @@ pub type IoResult<T> = Result<T, IoError>;
 /// # FIXME
 ///
 /// Is something like this sufficient? It's kind of archaic
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct IoError {
     /// An enumeration which can be matched against for determining the flavor
     /// of error.
@@ -376,7 +376,7 @@ impl Error for IoError {
 }
 
 /// A list specifying general categories of I/O error.
-#[derive(Copy, PartialEq, Eq, Clone, Show)]
+#[derive(Copy, PartialEq, Eq, Clone, Debug)]
 pub enum IoErrorKind {
     /// Any I/O error not part of this list.
     OtherIoError,
@@ -1662,7 +1662,7 @@ pub fn standard_error(kind: IoErrorKind) -> IoError {
 /// A mode specifies how a file should be opened or created. These modes are
 /// passed to `File::open_mode` and are used to control where the file is
 /// positioned when it is initially opened.
-#[derive(Copy, Clone, PartialEq, Eq, Show)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub enum FileMode {
     /// Opens a file positioned at the beginning.
     Open,
@@ -1674,7 +1674,7 @@ pub enum FileMode {
 
 /// Access permissions with which the file should be opened. `File`s
 /// opened with `Read` will return an error if written to.
-#[derive(Copy, Clone, PartialEq, Eq, Show)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub enum FileAccess {
     /// Read-only access, requests to write will result in an error
     Read,
@@ -1685,7 +1685,7 @@ pub enum FileAccess {
 }
 
 /// Different kinds of files which can be identified by a call to stat
-#[derive(Copy, PartialEq, Show, Hash, Clone)]
+#[derive(Copy, PartialEq, Debug, Hash, Clone)]
 pub enum FileType {
     /// This is a normal file, corresponding to `S_IFREG`
     RegularFile,
@@ -1789,7 +1789,7 @@ pub struct UnstableFileStat {
 bitflags! {
     /// A set of permissions for a file or directory is represented by a set of
     /// flags which are or'd together.
-    #[derive(Show)]
+    #[derive(Debug)]
     flags FilePermission: u32 {
         const USER_READ     = 0o400,
         const USER_WRITE    = 0o200,
@@ -1845,7 +1845,7 @@ mod tests {
     use prelude::v1::{Ok, Vec, Buffer, SliceExt};
     use uint;
 
-    #[derive(Clone, PartialEq, Show)]
+    #[derive(Clone, PartialEq, Debug)]
     enum BadReaderBehavior {
         GoodBehavior(uint),
         BadBehavior(uint)

src/libstd/old_io/net/addrinfo.rs

@@ -29,7 +29,7 @@ use sys;
 use vec::Vec;
 
 /// Hints to the types of sockets that are desired when looking up hosts
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum SocketType {
     Stream, Datagram, Raw
 }
@@ -38,7 +38,7 @@ pub enum SocketType {
 /// to manipulate how a query is performed.
 ///
 /// The meaning of each of these flags can be found with `man -s 3 getaddrinfo`
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum Flag {
     AddrConfig,
     All,
@@ -51,7 +51,7 @@ pub enum Flag {
 
 /// A transport protocol associated with either a hint or a return value of
 /// `lookup`
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum Protocol {
     TCP, UDP
 }
@@ -61,7 +61,7 @@ pub enum Protocol {
 ///
 /// For details on these fields, see their corresponding definitions via
 /// `man -s 3 getaddrinfo`
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub struct Hint {
     pub family: uint,
     pub socktype: Option<SocketType>,
@@ -69,7 +69,7 @@ pub struct Hint {
     pub flags: uint,
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub struct Info {
     pub address: SocketAddr,
     pub family: uint,

src/libstd/old_io/net/ip.rs

@@ -32,7 +32,7 @@ use vec::Vec;
 
 pub type Port = u16;
 
-#[derive(Copy, PartialEq, Eq, Clone, Hash, Show)]
+#[derive(Copy, PartialEq, Eq, Clone, Hash, Debug)]
 pub enum IpAddr {
     Ipv4Addr(u8, u8, u8, u8),
     Ipv6Addr(u16, u16, u16, u16, u16, u16, u16, u16)
@@ -64,7 +64,7 @@ impl fmt::Display for IpAddr {
     }
 }
 
-#[derive(Copy, PartialEq, Eq, Clone, Hash, Show)]
+#[derive(Copy, PartialEq, Eq, Clone, Hash, Debug)]
 pub struct SocketAddr {
     pub ip: IpAddr,
     pub port: Port,

src/libstd/old_io/process.rs

@@ -96,12 +96,12 @@ pub struct Process {
 /// A representation of environment variable name
 /// It compares case-insensitive on Windows and case-sensitive everywhere else.
 #[cfg(not(windows))]
-#[derive(Hash, PartialEq, Eq, Clone, Show)]
+#[derive(Hash, PartialEq, Eq, Clone, Debug)]
 struct EnvKey(CString);
 
 #[doc(hidden)]
 #[cfg(windows)]
-#[derive(Eq, Clone, Show)]
+#[derive(Eq, Clone, Debug)]
 struct EnvKey(CString);
 
 #[cfg(windows)]
@@ -492,7 +492,7 @@ pub enum StdioContainer {
 
 /// Describes the result of a process after it has terminated.
 /// Note that Windows have no signals, so the result is usually ExitStatus.
-#[derive(PartialEq, Eq, Clone, Copy, Show)]
+#[derive(PartialEq, Eq, Clone, Copy, Debug)]
 pub enum ProcessExit {
     /// Normal termination with an exit status.
     ExitStatus(int),

src/libstd/old_io/util.rs

@@ -16,7 +16,7 @@ use old_io;
 use slice::bytes::MutableByteVector;
 
 /// Wraps a `Reader`, limiting the number of bytes that can be read from it.
-#[derive(Show)]
+#[derive(Debug)]
 pub struct LimitReader<R> {
     limit: uint,
     inner: R
@@ -78,7 +78,7 @@ impl<R: Buffer> Buffer for LimitReader<R> {
 }
 
 /// A `Writer` which ignores bytes written to it, like /dev/null.
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub struct NullWriter;
 
 impl Writer for NullWriter {
@@ -87,7 +87,7 @@ impl Writer for NullWriter {
 }
 
 /// A `Reader` which returns an infinite stream of 0 bytes, like /dev/zero.
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub struct ZeroReader;
 
 impl Reader for ZeroReader {
@@ -108,7 +108,7 @@ impl Buffer for ZeroReader {
 }
 
 /// A `Reader` which is always at EOF, like /dev/null.
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub struct NullReader;
 
 impl Reader for NullReader {
@@ -129,7 +129,7 @@ impl Buffer for NullReader {
 ///
 /// The `Writer`s are delegated to in order. If any `Writer` returns an error,
 /// that error is returned immediately and remaining `Writer`s are not called.
-#[derive(Show)]
+#[derive(Debug)]
 pub struct MultiWriter<W> {
     writers: Vec<W>
 }
@@ -161,7 +161,7 @@ impl<W> Writer for MultiWriter<W> where W: Writer {
 
 /// A `Reader` which chains input from multiple `Reader`s, reading each to
 /// completion before moving onto the next.
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct ChainedReader<I, R> {
     readers: I,
     cur_reader: Option<R>,
@@ -200,7 +200,7 @@ impl<R: Reader, I: Iterator<Item=R>> Reader for ChainedReader<I, R> {
 
 /// A `Reader` which forwards input from another `Reader`, passing it along to
 /// a `Writer` as well. Similar to the `tee(1)` command.
-#[derive(Show)]
+#[derive(Debug)]
 pub struct TeeReader<R, W> {
     reader: R,
     writer: W,
@@ -242,7 +242,7 @@ pub fn copy<R: Reader, W: Writer>(r: &mut R, w: &mut W) -> old_io::IoResult<()>
 }
 
 /// An adaptor converting an `Iterator<u8>` to a `Reader`.
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub struct IterReader<T> {
     iter: T,
 }

src/libstd/os.rs

@@ -857,7 +857,7 @@ pub enum MapOption {
 }
 
 /// Possible errors when creating a map.
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum MapError {
     /// # The following are POSIX-specific
     ///

src/libstd/path/windows.rs

@@ -959,7 +959,7 @@ pub fn is_sep_byte_verbatim(u: &u8) -> bool {
 }
 
 /// Prefix types for Path
-#[derive(Copy, PartialEq, Clone, Show)]
+#[derive(Copy, PartialEq, Clone, Debug)]
 pub enum PathPrefix {
     /// Prefix `\\?\`, uint is the length of the following component
     VerbatimPrefix(uint),

src/libstd/sync/mpsc/mod.rs

@@ -390,13 +390,13 @@ pub struct SendError<T>(pub T);
 ///
 /// The `recv` operation can only fail if the sending half of a channel is
 /// disconnected, implying that no further messages will ever be received.
-#[derive(PartialEq, Eq, Clone, Copy, Show)]
+#[derive(PartialEq, Eq, Clone, Copy, Debug)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct RecvError;
 
 /// This enumeration is the list of the possible reasons that try_recv could not
 /// return data when called.
-#[derive(PartialEq, Clone, Copy, Show)]
+#[derive(PartialEq, Clone, Copy, Debug)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum TryRecvError {
     /// This channel is currently empty, but the sender(s) have not yet

src/libstd/sync/mpsc/sync.rs

@@ -105,7 +105,7 @@ struct Buffer<T> {
     size: uint,
 }
 
-#[derive(Show)]
+#[derive(Debug)]
 pub enum Failure {
     Empty,
     Disconnected,

src/libstd/sys/common/net.rs

@@ -32,7 +32,7 @@ use old_io;
 
 // FIXME: move uses of Arc and deadline tracking to std::io
 
-#[derive(Show)]
+#[derive(Debug)]
 pub enum SocketStatus {
     Readable,
     Writable,

src/libstd/time/duration.rs

@@ -45,7 +45,7 @@ macro_rules! try_opt {
 
 /// ISO 8601 time duration with nanosecond precision.
 /// This also allows for the negative duration; see individual methods for details.
-#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
 pub struct Duration {
     secs: i64,
     nanos: i32, // Always 0 <= nanos < NANOS_PER_SEC

src/libsyntax/abi.rs

@@ -15,7 +15,7 @@ pub use self::AbiArchitecture::*;
 
 use std::fmt;
 
-#[derive(Copy, PartialEq, Eq, Show)]
+#[derive(Copy, PartialEq, Eq, Debug)]
 pub enum Os {
     OsWindows,
     OsMacos,
@@ -26,7 +26,7 @@ pub enum Os {
     OsDragonfly,
 }
 
-#[derive(PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Clone, Copy, Show)]
+#[derive(PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Clone, Copy, Debug)]
 pub enum Abi {
     // NB: This ordering MUST match the AbiDatas array below.
     // (This is ensured by the test indices_are_correct().)
@@ -47,7 +47,7 @@ pub enum Abi {
 }
 
 #[allow(non_camel_case_types)]
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum Architecture {
     X86,
     X86_64,

src/libsyntax/ast.rs

@@ -208,14 +208,14 @@ impl Decodable for Ident {
 pub type FnIdent = Option<Ident>;
 
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash,
-           Show, Copy)]
+           Debug, Copy)]
 pub struct Lifetime {
     pub id: NodeId,
     pub span: Span,
     pub name: Name
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct LifetimeDef {
     pub lifetime: Lifetime,
     pub bounds: Vec<Lifetime>
@@ -224,7 +224,7 @@ pub struct LifetimeDef {
 /// A "Path" is essentially Rust's notion of a name; for instance:
 /// std::cmp::PartialEq  .  It's represented as a sequence of identifiers,
 /// along with a bunch of supporting information.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Path {
     pub span: Span,
     /// A `::foo` path, is relative to the crate root rather than current
@@ -236,7 +236,7 @@ pub struct Path {
 
 /// A segment of a path: an identifier, an optional lifetime, and a set of
 /// types.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct PathSegment {
     /// The identifier portion of this path segment.
     pub identifier: Ident,
@@ -249,7 +249,7 @@ pub struct PathSegment {
     pub parameters: PathParameters,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum PathParameters {
     AngleBracketedParameters(AngleBracketedParameterData),
     ParenthesizedParameters(ParenthesizedParameterData),
@@ -327,7 +327,7 @@ impl PathParameters {
 }
 
 /// A path like `Foo<'a, T>`
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct AngleBracketedParameterData {
     /// The lifetime parameters for this path segment.
     pub lifetimes: Vec<Lifetime>,
@@ -345,7 +345,7 @@ impl AngleBracketedParameterData {
 }
 
 /// A path like `Foo(A,B) -> C`
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct ParenthesizedParameterData {
     /// Overall span
     pub span: Span,
@@ -362,7 +362,7 @@ pub type CrateNum = u32;
 pub type NodeId = u32;
 
 #[derive(Clone, Eq, Ord, PartialOrd, PartialEq, RustcEncodable,
-           RustcDecodable, Hash, Show, Copy)]
+           RustcDecodable, Hash, Debug, Copy)]
 pub struct DefId {
     pub krate: CrateNum,
     pub node: NodeId,
@@ -382,7 +382,7 @@ pub const DUMMY_NODE_ID: NodeId = -1;
 /// typeck::collect::compute_bounds matches these against
 /// the "special" built-in traits (see middle::lang_items) and
 /// detects Copy, Send and Sync.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum TyParamBound {
     TraitTyParamBound(PolyTraitRef, TraitBoundModifier),
     RegionTyParamBound(Lifetime)
@@ -390,7 +390,7 @@ pub enum TyParamBound {
 
 /// A modifier on a bound, currently this is only used for `?Sized`, where the
 /// modifier is `Maybe`. Negative bounds should also be handled here.
-#[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum TraitBoundModifier {
     None,
     Maybe,
@@ -398,7 +398,7 @@ pub enum TraitBoundModifier {
 
 pub type TyParamBounds = OwnedSlice<TyParamBound>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct TyParam {
     pub ident: Ident,
     pub id: NodeId,
@@ -409,7 +409,7 @@ pub struct TyParam {
 
 /// Represents lifetimes and type parameters attached to a declaration
 /// of a function, enum, trait, etc.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Generics {
     pub lifetimes: Vec<LifetimeDef>,
     pub ty_params: OwnedSlice<TyParam>,
@@ -428,34 +428,34 @@ impl Generics {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct WhereClause {
     pub id: NodeId,
     pub predicates: Vec<WherePredicate>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum WherePredicate {
     BoundPredicate(WhereBoundPredicate),
     RegionPredicate(WhereRegionPredicate),
     EqPredicate(WhereEqPredicate)
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct WhereBoundPredicate {
     pub span: Span,
     pub bounded_ty: P<Ty>,
     pub bounds: OwnedSlice<TyParamBound>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct WhereRegionPredicate {
     pub span: Span,
     pub lifetime: Lifetime,
     pub bounds: Vec<Lifetime>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct WhereEqPredicate {
     pub id: NodeId,
     pub span: Span,
@@ -467,7 +467,7 @@ pub struct WhereEqPredicate {
 /// used to drive conditional compilation
 pub type CrateConfig = Vec<P<MetaItem>> ;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Crate {
     pub module: Mod,
     pub attrs: Vec<Attribute>,
@@ -478,7 +478,7 @@ pub struct Crate {
 
 pub type MetaItem = Spanned<MetaItem_>;
 
-#[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum MetaItem_ {
     MetaWord(InternedString),
     MetaList(InternedString, Vec<P<MetaItem>>),
@@ -510,7 +510,7 @@ impl PartialEq for MetaItem_ {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Block {
     pub stmts: Vec<P<Stmt>>,
     pub expr: Option<P<Expr>>,
@@ -519,27 +519,27 @@ pub struct Block {
     pub span: Span,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Pat {
     pub id: NodeId,
     pub node: Pat_,
     pub span: Span,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct FieldPat {
     pub ident: Ident,
     pub pat: P<Pat>,
     pub is_shorthand: bool,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum BindingMode {
     BindByRef(Mutability),
     BindByValue(Mutability),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum PatWildKind {
     /// Represents the wildcard pattern `_`
     PatWildSingle,
@@ -548,7 +548,7 @@ pub enum PatWildKind {
     PatWildMulti,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Pat_ {
     /// Represents a wildcard pattern (either `_` or `..`)
     PatWild(PatWildKind),
@@ -577,13 +577,13 @@ pub enum Pat_ {
     PatMac(Mac),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum Mutability {
     MutMutable,
     MutImmutable,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum BinOp_ {
     BiAdd,
     BiSub,
@@ -607,7 +607,7 @@ pub enum BinOp_ {
 
 pub type BinOp = Spanned<BinOp_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum UnOp {
     UnUniq,
     UnDeref,
@@ -617,7 +617,7 @@ pub enum UnOp {
 
 pub type Stmt = Spanned<Stmt_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Stmt_ {
     /// Could be an item or a local (let) binding:
     StmtDecl(P<Decl>, NodeId),
@@ -631,7 +631,7 @@ pub enum Stmt_ {
     StmtMac(P<Mac>, MacStmtStyle),
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum MacStmtStyle {
     /// The macro statement had a trailing semicolon, e.g. `foo! { ... };`
     /// `foo!(...);`, `foo![...];`
@@ -646,7 +646,7 @@ pub enum MacStmtStyle {
 
 /// Where a local declaration came from: either a true `let ... =
 /// ...;`, or one desugared from the pattern of a for loop.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum LocalSource {
     LocalLet,
     LocalFor,
@@ -655,7 +655,7 @@ pub enum LocalSource {
 // FIXME (pending discussion of #1697, #2178...): local should really be
 // a refinement on pat.
 /// Local represents a `let` statement, e.g., `let <pat>:<ty> = <expr>;`
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Local {
     pub pat: P<Pat>,
     pub ty: Option<P<Ty>>,
@@ -667,7 +667,7 @@ pub struct Local {
 
 pub type Decl = Spanned<Decl_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Decl_ {
     /// A local (let) binding:
     DeclLocal(P<Local>),
@@ -676,7 +676,7 @@ pub enum Decl_ {
 }
 
 /// represents one arm of a 'match'
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Arm {
     pub attrs: Vec<Attribute>,
     pub pats: Vec<P<Pat>>,
@@ -684,7 +684,7 @@ pub struct Arm {
     pub body: P<Expr>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Field {
     pub ident: SpannedIdent,
     pub expr: P<Expr>,
@@ -693,26 +693,26 @@ pub struct Field {
 
 pub type SpannedIdent = Spanned<Ident>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum BlockCheckMode {
     DefaultBlock,
     UnsafeBlock(UnsafeSource),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum UnsafeSource {
     CompilerGenerated,
     UserProvided,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Expr {
     pub id: NodeId,
     pub node: Expr_,
     pub span: Span,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Expr_ {
     /// First expr is the place; second expr is the value.
     ExprBox(Option<P<Expr>>, P<Expr>),
@@ -776,28 +776,28 @@ pub enum Expr_ {
 ///     <Vec<T> as SomeTrait>::SomeAssociatedItem
 ///      ^~~~~     ^~~~~~~~~   ^~~~~~~~~~~~~~~~~~
 ///      self_type  trait_name  item_path
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct QPath {
     pub self_type: P<Ty>,
     pub trait_ref: P<TraitRef>,
     pub item_path: PathSegment,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum MatchSource {
     Normal,
     IfLetDesugar { contains_else_clause: bool },
     WhileLetDesugar,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum CaptureClause {
     CaptureByValue,
     CaptureByRef,
 }
 
 /// A delimited sequence of token trees
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Delimited {
     /// The type of delimiter
     pub delim: token::DelimToken,
@@ -832,7 +832,7 @@ impl Delimited {
 }
 
 /// A sequence of token treesee
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct SequenceRepetition {
     /// The sequence of token trees
     pub tts: Vec<TokenTree>,
@@ -846,7 +846,7 @@ pub struct SequenceRepetition {
 
 /// A Kleene-style [repetition operator](http://en.wikipedia.org/wiki/Kleene_star)
 /// for token sequences.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum KleeneOp {
     ZeroOrMore,
     OneOrMore,
@@ -864,7 +864,7 @@ pub enum KleeneOp {
 ///
 /// The RHS of an MBE macro is the only place `SubstNt`s are substituted.
 /// Nothing special happens to misnamed or misplaced `SubstNt`s.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 #[doc="For macro invocations; parsing is delegated to the macro"]
 pub enum TokenTree {
     /// A single token
@@ -955,14 +955,14 @@ pub type Mac = Spanned<Mac_>;
 /// is being invoked, and the vector of token-trees contains the source
 /// of the macro invocation.
 /// There's only one flavor, now, so this could presumably be simplified.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Mac_ {
     // NB: the additional ident for a macro_rules-style macro is actually
     // stored in the enclosing item. Oog.
     MacInvocTT(Path, Vec<TokenTree>, SyntaxContext),   // new macro-invocation
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum StrStyle {
     CookedStr,
     RawStr(usize)
@@ -970,7 +970,7 @@ pub enum StrStyle {
 
 pub type Lit = Spanned<Lit_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum Sign {
     Minus,
     Plus
@@ -986,7 +986,7 @@ impl Sign {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum LitIntType {
     SignedIntLit(IntTy, Sign),
     UnsignedIntLit(UintTy),
@@ -1003,7 +1003,7 @@ impl LitIntType {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Lit_ {
     LitStr(InternedString, StrStyle),
     LitBinary(Rc<Vec<u8>>),
@@ -1017,13 +1017,13 @@ pub enum Lit_ {
 
 // NB: If you change this, you'll probably want to change the corresponding
 // type structure in middle/ty.rs as well.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct MutTy {
     pub ty: P<Ty>,
     pub mutbl: Mutability,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct TypeField {
     pub ident: Ident,
     pub mt: MutTy,
@@ -1032,7 +1032,7 @@ pub struct TypeField {
 
 /// Represents a required method in a trait declaration,
 /// one without a default implementation
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct TypeMethod {
     pub ident: Ident,
     pub attrs: Vec<Attribute>,
@@ -1050,26 +1050,26 @@ pub struct TypeMethod {
 /// a default implementation A trait method is either required (meaning it
 /// doesn't have an implementation, just a signature) or provided (meaning it
 /// has a default implementation).
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum TraitItem {
     RequiredMethod(TypeMethod),
     ProvidedMethod(P<Method>),
     TypeTraitItem(P<AssociatedType>),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum ImplItem {
     MethodImplItem(P<Method>),
     TypeImplItem(P<Typedef>),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct AssociatedType {
     pub attrs: Vec<Attribute>,
     pub ty_param: TyParam,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Typedef {
     pub id: NodeId,
     pub span: Span,
@@ -1196,7 +1196,7 @@ impl FloatTy {
 }
 
 // Bind a type to an associated type: `A=Foo`.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct TypeBinding {
     pub id: NodeId,
     pub ident: Ident,
@@ -1206,7 +1206,7 @@ pub struct TypeBinding {
 
 
 // NB PartialEq method appears below.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Ty {
     pub id: NodeId,
     pub node: Ty_,
@@ -1214,7 +1214,7 @@ pub struct Ty {
 }
 
 /// Not represented directly in the AST, referred to by name through a ty_path.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum PrimTy {
     TyInt(IntTy),
     TyUint(UintTy),
@@ -1224,7 +1224,7 @@ pub enum PrimTy {
     TyChar
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct BareFnTy {
     pub unsafety: Unsafety,
     pub abi: Abi,
@@ -1232,7 +1232,7 @@ pub struct BareFnTy {
     pub decl: P<FnDecl>
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 /// The different kinds of types recognized by the compiler
 pub enum Ty_ {
     TyVec(P<Ty>),
@@ -1265,13 +1265,13 @@ pub enum Ty_ {
     TyInfer,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum AsmDialect {
     AsmAtt,
     AsmIntel
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct InlineAsm {
     pub asm: InternedString,
     pub asm_str_style: StrStyle,
@@ -1285,7 +1285,7 @@ pub struct InlineAsm {
 }
 
 /// represents an argument in a function header
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Arg {
     pub ty: P<Ty>,
     pub pat: P<Pat>,
@@ -1313,14 +1313,14 @@ impl Arg {
 }
 
 /// represents the header (not the body) of a function declaration
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct FnDecl {
     pub inputs: Vec<Arg>,
     pub output: FunctionRetTy,
     pub variadic: bool
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Unsafety {
     Unsafe,
     Normal,
@@ -1353,7 +1353,7 @@ impl fmt::Debug for ImplPolarity {
 }
 
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum FunctionRetTy {
     /// Functions with return type ! that always
     /// raise an error or exit (i.e. never return to the caller)
@@ -1377,7 +1377,7 @@ impl FunctionRetTy {
 }
 
 /// Represents the kind of 'self' associated with a method
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum ExplicitSelf_ {
     /// No self
     SelfStatic,
@@ -1391,7 +1391,7 @@ pub enum ExplicitSelf_ {
 
 pub type ExplicitSelf = Spanned<ExplicitSelf_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Method {
     pub attrs: Vec<Attribute>,
     pub id: NodeId,
@@ -1399,7 +1399,7 @@ pub struct Method {
     pub node: Method_,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Method_ {
     /// Represents a method declaration
     MethDecl(Ident,
@@ -1414,7 +1414,7 @@ pub enum Method_ {
     MethMac(Mac),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Mod {
     /// A span from the first token past `{` to the last token until `}`.
     /// For `mod foo;`, the inner span ranges from the first token
@@ -1423,30 +1423,30 @@ pub struct Mod {
     pub items: Vec<P<Item>>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct ForeignMod {
     pub abi: Abi,
     pub items: Vec<P<ForeignItem>>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct VariantArg {
     pub ty: P<Ty>,
     pub id: NodeId,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum VariantKind {
     TupleVariantKind(Vec<VariantArg>),
     StructVariantKind(P<StructDef>),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct EnumDef {
     pub variants: Vec<P<Variant>>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Variant_ {
     pub name: Ident,
     pub attrs: Vec<Attribute>,
@@ -1458,7 +1458,7 @@ pub struct Variant_ {
 
 pub type Variant = Spanned<Variant_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum PathListItem_ {
     PathListIdent { name: Ident, id: NodeId },
     PathListMod { id: NodeId }
@@ -1476,7 +1476,7 @@ pub type PathListItem = Spanned<PathListItem_>;
 
 pub type ViewPath = Spanned<ViewPath_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum ViewPath_ {
 
     /// `foo::bar::baz as quux`
@@ -1499,17 +1499,17 @@ pub type Attribute = Spanned<Attribute_>;
 /// Distinguishes between Attributes that decorate items and Attributes that
 /// are contained as statements within items. These two cases need to be
 /// distinguished for pretty-printing.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum AttrStyle {
     AttrOuter,
     AttrInner,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub struct AttrId(pub usize);
 
 /// Doc-comments are promoted to attributes that have is_sugared_doc = true
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Attribute_ {
     pub id: AttrId,
     pub style: AttrStyle,
@@ -1522,13 +1522,13 @@ pub struct Attribute_ {
 /// that the ref_id is for. The impl_id maps to the "self type" of this impl.
 /// If this impl is an ItemImpl, the impl_id is redundant (it could be the
 /// same as the impl's node id).
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct TraitRef {
     pub path: Path,
     pub ref_id: NodeId,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct PolyTraitRef {
     /// The `'a` in `<'a> Foo<&'a T>`
     pub bound_lifetimes: Vec<LifetimeDef>,
@@ -1537,7 +1537,7 @@ pub struct PolyTraitRef {
     pub trait_ref: TraitRef,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum Visibility {
     Public,
     Inherited,
@@ -1552,7 +1552,7 @@ impl Visibility {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct StructField_ {
     pub kind: StructFieldKind,
     pub id: NodeId,
@@ -1571,7 +1571,7 @@ impl StructField_ {
 
 pub type StructField = Spanned<StructField_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum StructFieldKind {
     NamedField(Ident, Visibility),
     /// Element of a tuple-like struct
@@ -1587,7 +1587,7 @@ impl StructFieldKind {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct StructDef {
     /// Fields, not including ctor
     pub fields: Vec<StructField>,
@@ -1600,7 +1600,7 @@ pub struct StructDef {
   FIXME (#3300): Should allow items to be anonymous. Right now
   we just use dummy names for anon items.
  */
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Item {
     pub ident: Ident,
     pub attrs: Vec<Attribute>,
@@ -1610,7 +1610,7 @@ pub struct Item {
     pub span: Span,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Item_ {
     // Optional location (containing arbitrary characters) from which
     // to fetch the crate sources.
@@ -1661,7 +1661,7 @@ impl Item_ {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct ForeignItem {
     pub ident: Ident,
     pub attrs: Vec<Attribute>,
@@ -1671,7 +1671,7 @@ pub struct ForeignItem {
     pub vis: Visibility,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum ForeignItem_ {
     ForeignItemFn(P<FnDecl>, Generics),
     ForeignItemStatic(P<Ty>, /* is_mutbl */ bool),
@@ -1686,7 +1686,7 @@ impl ForeignItem_ {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum ClosureKind {
     FnClosureKind,
     FnMutClosureKind,
@@ -1696,7 +1696,7 @@ pub enum ClosureKind {
 /// The data we save and restore about an inlined item or method.  This is not
 /// part of the AST that we parse from a file, but it becomes part of the tree
 /// that we trans.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum InlinedItem {
     IIItem(P<Item>),
     IITraitItem(DefId /* impl id */, TraitItem),
@@ -1707,7 +1707,7 @@ pub enum InlinedItem {
 /// A macro definition, in this crate or imported from another.
 ///
 /// Not parsed directly, but created on macro import or `macro_rules!` expansion.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct MacroDef {
     pub ident: Ident,
     pub attrs: Vec<Attribute>,

src/libsyntax/ast_map/mod.rs

@@ -32,7 +32,7 @@ use std::slice;
 
 pub mod blocks;
 
-#[derive(Clone, Copy, PartialEq, Show)]
+#[derive(Clone, Copy, PartialEq, Debug)]
 pub enum PathElem {
     PathMod(Name),
     PathName(Name)
@@ -104,7 +104,7 @@ pub fn path_to_string<PI: Iterator<Item=PathElem>>(path: PI) -> String {
     }).to_string()
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum Node<'ast> {
     NodeItem(&'ast Item),
     NodeForeignItem(&'ast ForeignItem),
@@ -126,7 +126,7 @@ pub enum Node<'ast> {
 
 /// Represents an entry and its parent Node ID
 /// The odd layout is to bring down the total size.
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 enum MapEntry<'ast> {
     /// Placeholder for holes in the map.
     NotPresent,
@@ -157,7 +157,7 @@ impl<'ast> Clone for MapEntry<'ast> {
     }
 }
 
-#[derive(Show)]
+#[derive(Debug)]
 struct InlinedParent {
     path: Vec<PathElem>,
     ii: InlinedItem

src/libsyntax/ast_util.rs

@@ -352,7 +352,7 @@ pub fn empty_generics() -> Generics {
 // ______________________________________________________________________
 // Enumerating the IDs which appear in an AST
 
-#[derive(RustcEncodable, RustcDecodable, Show, Copy)]
+#[derive(RustcEncodable, RustcDecodable, Debug, Copy)]
 pub struct IdRange {
     pub min: NodeId,
     pub max: NodeId,

src/libsyntax/attr.rs

@@ -346,7 +346,7 @@ pub fn cfg_matches(diagnostic: &SpanHandler, cfgs: &[P<MetaItem>], cfg: &ast::Me
 }
 
 /// Represents the #[deprecated] and friends attributes.
-#[derive(RustcEncodable,RustcDecodable,Clone,Show)]
+#[derive(RustcEncodable,RustcDecodable,Clone,Debug)]
 pub struct Stability {
     pub level: StabilityLevel,
     pub feature: InternedString,
@@ -358,7 +358,7 @@ pub struct Stability {
 }
 
 /// The available stability levels.
-#[derive(RustcEncodable,RustcDecodable,PartialEq,PartialOrd,Clone,Show,Copy)]
+#[derive(RustcEncodable,RustcDecodable,PartialEq,PartialOrd,Clone,Debug,Copy)]
 pub enum StabilityLevel {
     Unstable,
     Stable,
@@ -570,7 +570,7 @@ fn int_type_of_word(s: &str) -> Option<IntType> {
     }
 }
 
-#[derive(PartialEq, Show, RustcEncodable, RustcDecodable, Copy)]
+#[derive(PartialEq, Debug, RustcEncodable, RustcDecodable, Copy)]
 pub enum ReprAttr {
     ReprAny,
     ReprInt(Span, IntType),
@@ -589,7 +589,7 @@ impl ReprAttr {
     }
 }
 
-#[derive(Eq, Hash, PartialEq, Show, RustcEncodable, RustcDecodable, Copy)]
+#[derive(Eq, Hash, PartialEq, Debug, RustcEncodable, RustcDecodable, Copy)]
 pub enum IntType {
     SignedInt(ast::IntTy),
     UnsignedInt(ast::UintTy)