Use `const`s instead of `static`s where appropriate

This changes the type of some public constants/statics in libunicode.
Notably some `&'static &'static [(char, char)]` have changed
to `&'static [(char, char)]`. The regexp crate seems to be the
sole user of these, yet this is technically a [breaking-change]

src/compiletest/runtest.rs

@@ -127,7 +127,7 @@ fn run_rfail_test(config: &Config, props: &TestProps, testfile: &Path) {
     };
 
     // The value our Makefile configures valgrind to return on failure
-    static VALGRIND_ERR: int = 100;
+    const VALGRIND_ERR: int = 100;
     if proc_res.status.matches_exit_status(VALGRIND_ERR) {
         fatal_proc_rec("run-fail test isn't valgrind-clean!", &proc_res);
     }
@@ -139,7 +139,7 @@ fn run_rfail_test(config: &Config, props: &TestProps, testfile: &Path) {
 
 fn check_correct_failure_status(proc_res: &ProcRes) {
     // The value the rust runtime returns on failure
-    static RUST_ERR: int = 101;
+    const RUST_ERR: int = 101;
     if !proc_res.status.matches_exit_status(RUST_ERR) {
         fatal_proc_rec(
             &format!("failure produced the wrong error: {:?}",

src/compiletest/util.rs

@@ -14,7 +14,7 @@ use common::Config;
 use std::env;
 
 /// Conversion table from triple OS name to Rust SYSNAME
-static OS_TABLE: &'static [(&'static str, &'static str)] = &[
+const OS_TABLE: &'static [(&'static str, &'static str)] = &[
     ("mingw32", "windows"),
     ("win32", "windows"),
     ("windows", "windows"),

src/etc/unicode.py

@@ -290,11 +290,11 @@ def emit_bsearch_range_table(f):
 fn bsearch_range_table(c: char, r: &'static [(char,char)]) -> bool {
     use core::cmp::Ordering::{Equal, Less, Greater};
     use core::slice::SliceExt;
-    r.binary_search(|&(lo,hi)| {
+    r.binary_search_by(|&(lo,hi)| {
         if lo <= c && c <= hi { Equal }
         else if hi < c { Less }
         else { Greater }
-    }).found().is_some()
+    }).is_ok()
 }\n
 """)
 
@@ -303,7 +303,7 @@ def emit_table(f, name, t_data, t_type = "&'static [(char, char)]", is_pub=True,
     pub_string = ""
     if is_pub:
         pub_string = "pub "
-    f.write("    %sstatic %s: %s = &[\n" % (pub_string, name, t_type))
+    f.write("    %sconst %s: %s = &[\n" % (pub_string, name, t_type))
     data = ""
     first = True
     for dat in t_data:
@@ -329,14 +329,14 @@ def emit_property_module(f, mod, tbl, emit_fn):
 def emit_regex_module(f, cats, w_data):
     f.write("pub mod regex {\n")
     regex_class = "&'static [(char, char)]"
-    class_table = "&'static [(&'static str, &'static %s)]" % regex_class
+    class_table = "&'static [(&'static str, %s)]" % regex_class
 
     emit_table(f, "UNICODE_CLASSES", cats, class_table,
-        pfun=lambda x: "(\"%s\",&super::%s::%s_table)" % (x[0], x[1], x[0]))
+        pfun=lambda x: "(\"%s\",super::%s::%s_table)" % (x[0], x[1], x[0]))
 
-    f.write("    pub static PERLD: &'static %s = &super::general_category::Nd_table;\n\n"
+    f.write("    pub const PERLD: %s = super::general_category::Nd_table;\n\n"
             % regex_class)
-    f.write("    pub static PERLS: &'static %s = &super::property::White_Space_table;\n\n"
+    f.write("    pub const PERLS: %s = super::property::White_Space_table;\n\n"
             % regex_class)
 
     emit_table(f, "PERLW", w_data, regex_class)
@@ -350,7 +350,7 @@ def emit_conversions_module(f, lowerupper, upperlower):
     use core::slice::SliceExt;
     use core::option::Option;
     use core::option::Option::{Some, None};
-    use core::slice;
+    use core::result::Result::{Ok, Err};
 
     pub fn to_lower(c: char) -> char {
         match bsearch_case_table(c, LuLl_table) {
@@ -367,13 +367,13 @@ def emit_conversions_module(f, lowerupper, upperlower):
     }
 
     fn bsearch_case_table(c: char, table: &'static [(char, char)]) -> Option<usize> {
-        match table.binary_search(|&(key, _)| {
+        match table.binary_search_by(|&(key, _)| {
             if c == key { Equal }
             else if key < c { Less }
             else { Greater }
         }) {
-            slice::BinarySearchResult::Found(i) => Some(i),
-            slice::BinarySearchResult::NotFound(_) => None,
+            Ok(i) => Some(i),
+            Err(_) => None,
         }
     }
 
@@ -386,10 +386,9 @@ def emit_conversions_module(f, lowerupper, upperlower):
 
 def emit_grapheme_module(f, grapheme_table, grapheme_cats):
     f.write("""pub mod grapheme {
-    use core::kinds::Copy;
     use core::slice::SliceExt;
     pub use self::GraphemeCat::*;
-    use core::slice;
+    use core::result::Result::{Ok, Err};
 
     #[allow(non_camel_case_types)]
     #[derive(Clone, Copy)]
@@ -401,16 +400,16 @@ def emit_grapheme_module(f, grapheme_table, grapheme_cats):
 
     fn bsearch_range_value_table(c: char, r: &'static [(char, char, GraphemeCat)]) -> GraphemeCat {
         use core::cmp::Ordering::{Equal, Less, Greater};
-        match r.binary_search(|&(lo, hi, _)| {
+        match r.binary_search_by(|&(lo, hi, _)| {
             if lo <= c && c <= hi { Equal }
             else if hi < c { Less }
             else { Greater }
         }) {
-            slice::BinarySearchResult::Found(idx) => {
+            Ok(idx) => {
                 let (_, _, cat) = r[idx];
                 cat
             }
-            slice::BinarySearchResult::NotFound(_) => GC_Any
+            Err(_) => GC_Any
         }
     }
 
@@ -430,20 +429,20 @@ def emit_charwidth_module(f, width_table):
     f.write("    use core::option::Option;\n")
     f.write("    use core::option::Option::{Some, None};\n")
     f.write("    use core::slice::SliceExt;\n")
-    f.write("    use core::slice;\n")
+    f.write("    use core::result::Result::{Ok, Err};\n")
     f.write("""
     fn bsearch_range_value_table(c: char, is_cjk: bool, r: &'static [(char, char, u8, u8)]) -> u8 {
         use core::cmp::Ordering::{Equal, Less, Greater};
-        match r.binary_search(|&(lo, hi, _, _)| {
+        match r.binary_search_by(|&(lo, hi, _, _)| {
             if lo <= c && c <= hi { Equal }
             else if hi < c { Less }
             else { Greater }
         }) {
-            slice::BinarySearchResult::Found(idx) => {
+            Ok(idx) => {
                 let (_, _, r_ncjk, r_cjk) = r[idx];
                 if is_cjk { r_cjk } else { r_ncjk }
             }
-            slice::BinarySearchResult::NotFound(_) => 1
+            Err(_) => 1
         }
     }
 """)
@@ -530,17 +529,17 @@ def emit_norm_module(f, canon, compat, combine, norm_props):
     fn bsearch_range_value_table(c: char, r: &'static [(char, char, u8)]) -> u8 {
         use core::cmp::Ordering::{Equal, Less, Greater};
         use core::slice::SliceExt;
-        use core::slice;
-        match r.binary_search(|&(lo, hi, _)| {
+        use core::result::Result::{Ok, Err};
+        match r.binary_search_by(|&(lo, hi, _)| {
             if lo <= c && c <= hi { Equal }
             else if hi < c { Less }
             else { Greater }
         }) {
-            slice::BinarySearchResult::Found(idx) => {
+            Ok(idx) => {
                 let (_, _, result) = r[idx];
                 result
             }
-            slice::BinarySearchResult::NotFound(_) => 0
+            Err(_) => 0
         }
     }\n
 """)
@@ -609,7 +608,7 @@ if __name__ == "__main__":
             unicode_version = re.search(pattern, readme.read()).groups()
         rf.write("""
 /// The version of [Unicode](http://www.unicode.org/)
-/// that the `UnicodeChar` and `UnicodeStrPrelude` traits are based on.
+/// that the unicode parts of `CharExt` and `UnicodeStrPrelude` traits are based on.
 pub const UNICODE_VERSION: (u64, u64, u64) = (%s, %s, %s);
 """ % unicode_version)
         (canon_decomp, compat_decomp, gencats, combines,

src/libcollections/bit.rs

@@ -2544,7 +2544,7 @@ mod bit_vec_bench {
 
     use super::BitVec;
 
-    static BENCH_BITS : usize = 1 << 14;
+    const BENCH_BITS : usize = 1 << 14;
 
     fn rng() -> rand::IsaacRng {
         let seed: &[_] = &[1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
@@ -3039,7 +3039,7 @@ mod bit_set_bench {
 
     use super::{BitVec, BitSet};
 
-    static BENCH_BITS : usize = 1 << 14;
+    const BENCH_BITS : usize = 1 << 14;
 
     fn rng() -> rand::IsaacRng {
         let seed: &[_] = &[1, 2, 3, 4, 5, 6, 7, 8, 9, 0];

src/libcollections/slice.rs

@@ -1343,8 +1343,8 @@ fn insertion_sort<T, F>(v: &mut [T], mut compare: F) where F: FnMut(&T, &T) -> O
 
 fn merge_sort<T, F>(v: &mut [T], mut compare: F) where F: FnMut(&T, &T) -> Ordering {
     // warning: this wildly uses unsafe.
-    static BASE_INSERTION: usize = 32;
-    static LARGE_INSERTION: usize = 16;
+    const BASE_INSERTION: usize = 32;
+    const LARGE_INSERTION: usize = 16;
 
     // FIXME #12092: smaller insertion runs seems to make sorting
     // vectors of large elements a little faster on some platforms,

src/libcollections/string.rs

@@ -153,8 +153,8 @@ impl String {
             }
         }
 
-        static TAG_CONT_U8: u8 = 128u8;
-        static REPLACEMENT: &'static [u8] = b"\xEF\xBF\xBD"; // U+FFFD in UTF-8
+        const TAG_CONT_U8: u8 = 128u8;
+        const REPLACEMENT: &'static [u8] = b"\xEF\xBF\xBD"; // U+FFFD in UTF-8
         let total = v.len();
         fn unsafe_get(xs: &[u8], i: usize) -> u8 {
             unsafe { *xs.get_unchecked(i) }

src/libcollections/vec_deque.rs

@@ -39,8 +39,8 @@ use alloc::heap;
 #[unstable(feature = "collections")]
 pub use VecDeque as RingBuf;
 
-static INITIAL_CAPACITY: usize = 7; // 2^3 - 1
-static MINIMUM_CAPACITY: usize = 1; // 2 - 1
+const INITIAL_CAPACITY: usize = 7; // 2^3 - 1
+const MINIMUM_CAPACITY: usize = 1; // 2 - 1
 
 /// `VecDeque` is a growable ring buffer, which can be used as a
 /// double-ended queue efficiently.

src/libcore/fmt/float.rs

@@ -53,7 +53,7 @@ pub enum SignFormat {
     SignNeg
 }
 
-static DIGIT_E_RADIX: u32 = ('e' as u32) - ('a' as u32) + 11;
+const DIGIT_E_RADIX: u32 = ('e' as u32) - ('a' as u32) + 11;
 
 /// Converts a number to its string representation as a byte vector.
 /// This is meant to be a common base implementation for all numeric string

src/libcoretest/num/int_macros.rs

@@ -70,12 +70,12 @@ mod tests {
         assert!(-(0b11 as $T) - (1 as $T) == (0b11 as $T).not());
     }
 
-    static A: $T = 0b0101100;
-    static B: $T = 0b0100001;
-    static C: $T = 0b1111001;
+    const A: $T = 0b0101100;
+    const B: $T = 0b0100001;
+    const C: $T = 0b1111001;
 
-    static _0: $T = 0;
-    static _1: $T = !0;
+    const _0: $T = 0;
+    const _1: $T = !0;
 
     #[test]
     fn test_count_ones() {

src/libcoretest/num/uint_macros.rs

@@ -38,12 +38,12 @@ mod tests {
         assert!(MAX - (0b1011 as $T) == (0b1011 as $T).not());
     }
 
-    static A: $T = 0b0101100;
-    static B: $T = 0b0100001;
-    static C: $T = 0b1111001;
+    const A: $T = 0b0101100;
+    const B: $T = 0b0100001;
+    const C: $T = 0b1111001;
 
-    static _0: $T = 0;
-    static _1: $T = !0;
+    const _0: $T = 0;
+    const _1: $T = !0;
 
     #[test]
     fn test_count_ones() {

src/libflate/lib.rs

@@ -73,9 +73,9 @@ extern {
                                     -> *mut c_void;
 }
 
-static LZ_NORM : c_int = 0x80;  // LZ with 128 probes, "normal"
-static TINFL_FLAG_PARSE_ZLIB_HEADER : c_int = 0x1; // parse zlib header and adler32 checksum
-static TDEFL_WRITE_ZLIB_HEADER : c_int = 0x01000; // write zlib header and adler32 checksum
+const LZ_NORM: c_int = 0x80;  // LZ with 128 probes, "normal"
+const TINFL_FLAG_PARSE_ZLIB_HEADER: c_int = 0x1; // parse zlib header and adler32 checksum
+const TDEFL_WRITE_ZLIB_HEADER: c_int = 0x01000; // write zlib header and adler32 checksum
 
 fn deflate_bytes_internal(bytes: &[u8], flags: c_int) -> Option<Bytes> {
     unsafe {

src/librand/distributions/mod.rs

@@ -223,7 +223,7 @@ fn ziggurat<R: Rng, P, Z>(
             mut pdf: P,
             mut zero_case: Z)
             -> f64 where P: FnMut(f64) -> f64, Z: FnMut(&mut R, f64) -> f64 {
-    static SCALE: f64 = (1u64 << 53) as f64;
+    const SCALE: f64 = (1u64 << 53) as f64;
     loop {
         // reimplement the f64 generation as an optimisation suggested
         // by the Doornik paper: we have a lot of precision-space

src/librand/isaac.rs

@@ -127,7 +127,7 @@ impl IsaacRng {
         let mut a = self.a;
         let mut b = self.b + self.c;
 
-        static MIDPOINT: uint = (RAND_SIZE / 2) as uint;
+        const MIDPOINT: uint = (RAND_SIZE / 2) as uint;
 
         macro_rules! ind {
             ($x:expr) => ( self.mem[(($x >> 2) as uint & ((RAND_SIZE - 1) as uint))] )

src/librand/lib.rs

@@ -52,7 +52,7 @@ use distributions::{Range, IndependentSample};
 use distributions::range::SampleRange;
 
 #[cfg(test)]
-static RAND_BENCH_N: u64 = 100;
+const RAND_BENCH_N: u64 = 100;
 
 pub mod distributions;
 pub mod isaac;
@@ -342,7 +342,7 @@ impl<'a, R: Rng> Iterator for AsciiGenerator<'a, R> {
     type Item = char;
 
     fn next(&mut self) -> Option<char> {
-        static GEN_ASCII_STR_CHARSET: &'static [u8] =
+        const GEN_ASCII_STR_CHARSET: &'static [u8] =
             b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
               abcdefghijklmnopqrstuvwxyz\
               0123456789";

src/librand/rand_impls.rs

@@ -141,7 +141,7 @@ impl Rand for char {
     #[inline]
     fn rand<R: Rng>(rng: &mut R) -> char {
         // a char is 21 bits
-        static CHAR_MASK: u32 = 0x001f_ffff;
+        const CHAR_MASK: u32 = 0x001f_ffff;
         loop {
             // Rejection sampling. About 0.2% of numbers with at most
             // 21-bits are invalid codepoints (surrogates), so this

src/librand/reseeding.rs

@@ -18,7 +18,7 @@ use core::default::Default;
 
 /// How many bytes of entropy the underling RNG is allowed to generate
 /// before it is reseeded.
-static DEFAULT_GENERATION_THRESHOLD: uint = 32 * 1024;
+const DEFAULT_GENERATION_THRESHOLD: uint = 32 * 1024;
 
 /// A wrapper around any RNG which reseeds the underlying RNG after it
 /// has generated a certain number of random bytes.
@@ -212,7 +212,7 @@ mod test {
         assert_eq!(string1, string2);
     }
 
-    static FILL_BYTES_V_LEN: uint = 13579;
+    const FILL_BYTES_V_LEN: uint = 13579;
     #[test]
     fn test_rng_fill_bytes() {
         let mut v = repeat(0u8).take(FILL_BYTES_V_LEN).collect::<Vec<_>>();

src/librbml/io.rs

@@ -13,7 +13,7 @@ use std::old_io;
 use std::slice;
 use std::iter::repeat;
 
-static BUF_CAPACITY: uint = 128;
+const BUF_CAPACITY: uint = 128;
 
 fn combine(seek: SeekStyle, cur: uint, end: uint, offset: i64) -> IoResult<u64> {
     // compute offset as signed and clamp to prevent overflow

src/librbml/lib.rs

@@ -856,9 +856,9 @@ pub mod writer {
     // Set to true to generate more debugging in EBML code.
     // Totally lame approach.
     #[cfg(not(ndebug))]
-    static DEBUG: bool = true;
+    const DEBUG: bool = true;
     #[cfg(ndebug)]
-    static DEBUG: bool = false;
+    const DEBUG: bool = false;
 
     impl<'a, W: Writer + Seek> Encoder<'a, W> {
         // used internally to emit things like the vector length and so on

src/librustc/metadata/filesearch.rs

@@ -202,9 +202,9 @@ pub fn get_or_default_sysroot() -> Path {
 }
 
 #[cfg(windows)]
-static PATH_ENTRY_SEPARATOR: &'static str = ";";
+const PATH_ENTRY_SEPARATOR: char = ';';
 #[cfg(not(windows))]
-static PATH_ENTRY_SEPARATOR: &'static str = ":";
+const PATH_ENTRY_SEPARATOR: char = ':';
 
 /// Returns RUST_PATH as a string, without default paths added
 pub fn get_rust_path() -> Option<String> {

src/librustc/middle/liveness.rs

@@ -540,9 +540,9 @@ struct Specials {
     clean_exit_var: Variable
 }
 
-static ACC_READ: u32 = 1;
-static ACC_WRITE: u32 = 2;
-static ACC_USE: u32 = 4;
+const ACC_READ: u32 = 1;
+const ACC_WRITE: u32 = 2;
+const ACC_USE: u32 = 4;
 
 struct Liveness<'a, 'tcx: 'a> {
     ir: &'a mut IrMaps<'a, 'tcx>,

src/librustc/middle/ty.rs

@@ -5757,22 +5757,22 @@ pub fn closure_upvars<'tcx>(typer: &mc::Typer<'tcx>,
 
 pub fn is_binopable<'tcx>(cx: &ctxt<'tcx>, ty: Ty<'tcx>, op: ast::BinOp) -> bool {
     #![allow(non_upper_case_globals)]
-    static tycat_other: int = 0;
-    static tycat_bool: int = 1;
-    static tycat_char: int = 2;
-    static tycat_int: int = 3;
-    static tycat_float: int = 4;
-    static tycat_raw_ptr: int = 6;
+    const tycat_other: int = 0;
+    const tycat_bool: int = 1;
+    const tycat_char: int = 2;
+    const tycat_int: int = 3;
+    const tycat_float: int = 4;
+    const tycat_raw_ptr: int = 6;
 
-    static opcat_add: int = 0;
-    static opcat_sub: int = 1;
-    static opcat_mult: int = 2;
-    static opcat_shift: int = 3;
-    static opcat_rel: int = 4;
-    static opcat_eq: int = 5;
-    static opcat_bit: int = 6;
-    static opcat_logic: int = 7;
-    static opcat_mod: int = 8;
+    const opcat_add: int = 0;
+    const opcat_sub: int = 1;
+    const opcat_mult: int = 2;
+    const opcat_shift: int = 3;
+    const opcat_rel: int = 4;
+    const opcat_eq: int = 5;
+    const opcat_bit: int = 6;
+    const opcat_logic: int = 7;
+    const opcat_mod: int = 8;
 
     fn opcat(op: ast::BinOp) -> int {
         match op.node {
@@ -5811,8 +5811,8 @@ pub fn is_binopable<'tcx>(cx: &ctxt<'tcx>, ty: Ty<'tcx>, op: ast::BinOp) -> bool
         }
     }
 
-    static t: bool = true;
-    static f: bool = false;
+    const t: bool = true;
+    const f: bool = false;
 
     let tbl = [
     //           +, -, *, shift, rel, ==, bit, logic, mod

src/librustc_back/archive.rs

@@ -18,7 +18,7 @@ use std::os;
 use std::str;
 use syntax::diagnostic::Handler as ErrorHandler;
 
-pub static METADATA_FILENAME: &'static str = "rust.metadata.bin";
+pub const METADATA_FILENAME: &'static str = "rust.metadata.bin";
 
 pub struct ArchiveConfig<'a> {
     pub handler: &'a ErrorHandler,
@@ -242,7 +242,7 @@ impl<'a> ArchiveBuilder<'a> {
         // Don't allow the total size of `args` to grow beyond 32,000 bytes.
         // Windows will raise an error if the argument string is longer than
         // 32,768, and we leave a bit of extra space for the program name.
-        static ARG_LENGTH_LIMIT: uint = 32000;
+        const ARG_LENGTH_LIMIT: uint = 32_000;
 
         for member_name in &self.members {
             let len = member_name.as_vec().len();

src/librustc_back/fs.rs

@@ -15,7 +15,7 @@ use std::os;
 /// Returns an absolute path in the filesystem that `path` points to. The
 /// returned path does not contain any symlinks in its hierarchy.
 pub fn realpath(original: &Path) -> old_io::IoResult<Path> {
-    static MAX_LINKS_FOLLOWED: uint = 256;
+    const MAX_LINKS_FOLLOWED: uint = 256;
     let original = try!(os::getcwd()).join(original);
 
     // Right now lstat on windows doesn't work quite well

src/librustc_borrowck/borrowck/mod.rs

@@ -312,7 +312,7 @@ impl<'tcx> LoanPath<'tcx> {
 // FIXME (pnkfelix): See discussion here
 // https://github.com/pnkfelix/rust/commit/
 //     b2b39e8700e37ad32b486b9a8409b50a8a53aa51#commitcomment-7892003
-static DOWNCAST_PRINTED_OPERATOR : &'static str = " as ";
+const DOWNCAST_PRINTED_OPERATOR: &'static str = " as ";
 
 // A local, "cleaned" version of `mc::InteriorKind` that drops
 // information that is not relevant to loan-path analysis. (In

src/librustc_borrowck/borrowck/move_data.rs

@@ -91,8 +91,7 @@ impl Clone for MovePathIndex {
 }
 
 #[allow(non_upper_case_globals)]
-static InvalidMovePathIndex: MovePathIndex =
-    MovePathIndex(usize::MAX);
+const InvalidMovePathIndex: MovePathIndex = MovePathIndex(usize::MAX);
 
 /// Index into `MoveData.moves`, used like a pointer
 #[derive(Copy, PartialEq)]
@@ -105,8 +104,7 @@ impl MoveIndex {
 }
 
 #[allow(non_upper_case_globals)]
-static InvalidMoveIndex: MoveIndex =
-    MoveIndex(usize::MAX);
+const InvalidMoveIndex: MoveIndex = MoveIndex(usize::MAX);
 
 pub struct MovePath<'tcx> {
     /// Loan path corresponding to this move path

src/librustc_driver/lib.rs

@@ -93,7 +93,7 @@ pub mod driver;
 pub mod pretty;
 
 
-static BUG_REPORT_URL: &'static str =
+const BUG_REPORT_URL: &'static str =
     "https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports";
 
 
@@ -770,7 +770,7 @@ fn parse_crate_attrs(sess: &Session, input: &Input) ->
 /// The diagnostic emitter yielded to the procedure should be used for reporting
 /// errors of the compiler.
 pub fn monitor<F:FnOnce()+Send+'static>(f: F) {
-    static STACK_SIZE: uint = 8 * 1024 * 1024; // 8MB
+    const STACK_SIZE: uint = 8 * 1024 * 1024; // 8MB
 
     let (tx, rx) = channel();
     let w = old_io::ChanWriter::new(tx);

src/librustc_driver/test.rs

@@ -44,7 +44,7 @@ struct RH<'a> {
     sub: &'a [RH<'a>]
 }
 
-static EMPTY_SOURCE_STR: &'static str = "#![feature(no_std)] #![no_std]";
+const EMPTY_SOURCE_STR: &'static str = "#![feature(no_std)] #![no_std]";
 
 struct ExpectErrorEmitter {
     messages: Vec<String>

src/librustc_lint/builtin.rs

@@ -571,7 +571,7 @@ struct RawPtrDeriveVisitor<'a, 'tcx: 'a> {
 
 impl<'a, 'tcx, 'v> Visitor<'v> for RawPtrDeriveVisitor<'a, 'tcx> {
     fn visit_ty(&mut self, ty: &ast::Ty) {
-        static MSG: &'static str = "use of `#[derive]` with a raw pointer";
+        const MSG: &'static str = "use of `#[derive]` with a raw pointer";
         if let ast::TyPtr(..) = ty.node {
             self.cx.span_lint(RAW_POINTER_DERIVE, ty.span, MSG);
         }

src/librustc_trans/back/link.rs

@@ -317,7 +317,7 @@ pub fn mangle_exported_name<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, path: PathEl
     // e.g. `fn foo() { { fn a() {} } { fn a() {} } }`, so we
     // generate unique characters from the node id. For now
     // hopefully 3 characters is enough to avoid collisions.
-    static EXTRA_CHARS: &'static str =
+    const EXTRA_CHARS: &'static str =
         "abcdefghijklmnopqrstuvwxyz\
          ABCDEFGHIJKLMNOPQRSTUVWXYZ\
          0123456789";

src/librustc_trans/trans/adt.rs

@@ -487,12 +487,12 @@ fn range_to_inttype(cx: &CrateContext, hint: Hint, bounds: &IntBounds) -> IntTyp
     debug!("range_to_inttype: {:?} {:?}", hint, bounds);
     // Lists of sizes to try.  u64 is always allowed as a fallback.
     #[allow(non_upper_case_globals)]
-    static choose_shortest: &'static[IntType] = &[
+    const choose_shortest: &'static [IntType] = &[
         attr::UnsignedInt(ast::TyU8), attr::SignedInt(ast::TyI8),
         attr::UnsignedInt(ast::TyU16), attr::SignedInt(ast::TyI16),
         attr::UnsignedInt(ast::TyU32), attr::SignedInt(ast::TyI32)];
     #[allow(non_upper_case_globals)]
-    static at_least_32: &'static[IntType] = &[
+    const at_least_32: &'static [IntType] = &[
         attr::UnsignedInt(ast::TyU32), attr::SignedInt(ast::TyI32)];
 
     let attempts;

src/librustc_trans/trans/meth.rs

@@ -45,7 +45,7 @@ use syntax::ast_util::PostExpansionMethod;
 use syntax::codemap::DUMMY_SP;
 
 // drop_glue pointer, size, align.
-static VTABLE_OFFSET: uint = 3;
+const VTABLE_OFFSET: uint = 3;
 
 /// The main "translation" pass for methods.  Generates code
 /// for non-monomorphized methods only.  Other methods will

src/librustdoc/flock.rs

@@ -167,7 +167,7 @@ mod imp {
     use std::os;
     use std::ptr;
 
-    static LOCKFILE_EXCLUSIVE_LOCK: libc::DWORD = 0x00000002;
+    const LOCKFILE_EXCLUSIVE_LOCK: libc::DWORD = 0x00000002;
 
     #[allow(non_snake_case)]
     extern "system" {

src/librustdoc/lib.rs

@@ -94,7 +94,7 @@ type Pass = (&'static str,                                      // name
              fn(clean::Crate) -> plugins::PluginResult,         // fn
              &'static str);                                     // description
 
-static PASSES: &'static [Pass] = &[
+const PASSES: &'static [Pass] = &[
     ("strip-hidden", passes::strip_hidden,
      "strips all doc(hidden) items from the output"),
     ("unindent-comments", passes::unindent_comments,
@@ -105,7 +105,7 @@ static PASSES: &'static [Pass] = &[
      "strips all private items from a crate which cannot be seen externally"),
 ];
 
-static DEFAULT_PASSES: &'static [&'static str] = &[
+const DEFAULT_PASSES: &'static [&'static str] = &[
     "strip-hidden",
     "strip-private",
     "collapse-docs",

src/libserialize/hex.rs

@@ -24,7 +24,7 @@ pub trait ToHex {
     fn to_hex(&self) -> String;
 }
 
-static CHARS: &'static[u8] = b"0123456789abcdef";
+const CHARS: &'static [u8] = b"0123456789abcdef";
 
 impl ToHex for [u8] {
     /// Turn a vector of `u8` bytes into a hexadecimal string.

src/libstd/net/tcp.rs

@@ -425,7 +425,7 @@ mod tests {
 
     #[test]
     fn multiple_connect_interleaved_lazy_schedule_ip4() {
-        static MAX: usize = 10;
+        const MAX: usize = 10;
         each_ip(&mut |addr| {
             let acceptor = t!(TcpListener::bind(&addr));
 

src/libstd/num/strconv.rs

@@ -422,8 +422,8 @@ pub fn float_to_str_common<T: Float>(
 
 // Some constants for from_str_bytes_common's input validation,
 // they define minimum radix values for which the character is a valid digit.
-static DIGIT_P_RADIX: u32 = ('p' as u32) - ('a' as u32) + 11;
-static DIGIT_E_RADIX: u32 = ('e' as u32) - ('a' as u32) + 11;
+const DIGIT_P_RADIX: u32 = ('p' as u32) - ('a' as u32) + 11;
+const DIGIT_E_RADIX: u32 = ('e' as u32) - ('a' as u32) + 11;
 
 #[cfg(test)]
 mod tests {

src/libstd/rand/mod.rs

@@ -321,7 +321,7 @@ impl reseeding::Reseeder<StdRng> for ThreadRngReseeder {
         }
     }
 }
-static THREAD_RNG_RESEED_THRESHOLD: usize = 32_768;
+const THREAD_RNG_RESEED_THRESHOLD: usize = 32_768;
 type ThreadRngInner = reseeding::ReseedingRng<StdRng, ThreadRngReseeder>;
 
 /// The thread-local RNG.
@@ -638,19 +638,18 @@ mod test {
     }
 }
 
-#[cfg(test)]
-static RAND_BENCH_N: u64 = 100;
-
 #[cfg(test)]
 mod bench {
     extern crate test;
     use prelude::v1::*;
 
     use self::test::Bencher;
-    use super::{XorShiftRng, StdRng, IsaacRng, Isaac64Rng, Rng, RAND_BENCH_N};
+    use super::{XorShiftRng, StdRng, IsaacRng, Isaac64Rng, Rng};
     use super::{OsRng, weak_rng};
     use mem::size_of;
 
+    const RAND_BENCH_N: u64 = 100;
+
     #[bench]
     fn rand_xorshift(b: &mut Bencher) {
         let mut rng: XorShiftRng = OsRng::new().unwrap().gen();

src/libstd/rand/os.rs

@@ -281,9 +281,9 @@ mod imp {
         hcryptprov: HCRYPTPROV
     }
 
-    static PROV_RSA_FULL: DWORD = 1;
-    static CRYPT_SILENT: DWORD = 64;
-    static CRYPT_VERIFYCONTEXT: DWORD = 0xF0000000;
+    const PROV_RSA_FULL: DWORD = 1;
+    const CRYPT_SILENT: DWORD = 64;
+    const CRYPT_VERIFYCONTEXT: DWORD = 0xF0000000;
 
     #[allow(non_snake_case)]
     extern "system" {

src/libstd/sync/mpsc/mod.rs

@@ -1157,8 +1157,8 @@ mod test {
 
     #[test]
     fn stress_shared() {
-        static AMT: u32 = 10000;
-        static NTHREADS: u32 = 8;
+        const AMT: u32 = 10000;
+        const NTHREADS: u32 = 8;
         let (tx, rx) = channel::<i32>();
 
         let t = thread::spawn(move|| {
@@ -1663,8 +1663,8 @@ mod sync_tests {
 
     #[test]
     fn stress_shared() {
-        static AMT: u32 = 1000;
-        static NTHREADS: u32 = 8;
+        const AMT: u32 = 1000;
+        const NTHREADS: u32 = 8;
         let (tx, rx) = sync_channel::<i32>(0);
         let (dtx, drx) = sync_channel::<()>(0);
 

src/libstd/sync/mpsc/select.rs

@@ -473,7 +473,7 @@ mod test {
 
     #[test]
     fn stress() {
-        static AMT: i32 = 10000;
+        const AMT: i32 = 10000;
         let (tx1, rx1) = channel::<i32>();
         let (tx2, rx2) = channel::<i32>();
         let (tx3, rx3) = channel::<()>();

src/libstd/sync/mutex.rs

@@ -390,8 +390,8 @@ mod test {
     fn lots_and_lots() {
         static M: StaticMutex = MUTEX_INIT;
         static mut CNT: u32 = 0;
-        static J: u32 = 1000;
-        static K: u32 = 3;
+        const J: u32 = 1000;
+        const K: u32 = 3;
 
         fn inc() {
             for _ in 0..J {

src/libstd/sync/rwlock.rs

@@ -436,8 +436,8 @@ mod tests {
     #[test]
     fn frob() {
         static R: StaticRwLock = RW_LOCK_INIT;
-        static N: usize = 10;
-        static M: usize = 1000;
+        const N: usize = 10;
+        const M: usize = 1000;
 
         let (tx, rx) = channel::<()>();
         for _ in 0..N {

src/libstd/sys/common/wtf8.rs

@@ -43,7 +43,7 @@ use sys_common::AsInner;
 use unicode::str::{Utf16Item, utf16_items};
 use vec::Vec;
 
-static UTF8_REPLACEMENT_CHARACTER: &'static [u8] = b"\xEF\xBF\xBD";
+const UTF8_REPLACEMENT_CHARACTER: &'static [u8] = b"\xEF\xBF\xBD";
 
 /// A Unicode code point: from U+0000 to U+10FFFF.
 ///

src/libstd/sys/windows/os.rs

@@ -59,8 +59,8 @@ pub fn error_string(errnum: i32) -> String {
                           -> DWORD;
     }
 
-    static FORMAT_MESSAGE_FROM_SYSTEM: DWORD = 0x00001000;
-    static FORMAT_MESSAGE_IGNORE_INSERTS: DWORD = 0x00000200;
+    const FORMAT_MESSAGE_FROM_SYSTEM: DWORD = 0x00001000;
+    const FORMAT_MESSAGE_IGNORE_INSERTS: DWORD = 0x00000200;
 
     // This value is calculated from the macro
     // MAKELANGID(LANG_SYSTEM_DEFAULT, SUBLANG_SYS_DEFAULT)

src/libstd/thread.rs

@@ -853,7 +853,7 @@ mod test {
         // climbing the task tree to dereference each ancestor. (See #1789)
         // (well, it would if the constant were 8000+ - I lowered it to be more
         // valgrind-friendly. try this at home, instead..!)
-        static GENERATIONS: usize = 16;
+        const GENERATIONS: usize = 16;
         fn child_no(x: usize) -> Thunk<'static> {
             return Thunk::new(move|| {
                 if x < GENERATIONS {

src/libsyntax/abi.rs

@@ -77,11 +77,11 @@ pub enum AbiArchitecture {
 }
 
 #[allow(non_upper_case_globals)]
-static AbiDatas: &'static [AbiData] = &[
+const AbiDatas: &'static [AbiData] = &[
     // Platform-specific ABIs
     AbiData {abi: Cdecl, name: "cdecl" },
     AbiData {abi: Stdcall, name: "stdcall" },
-    AbiData {abi: Fastcall, name:"fastcall" },
+    AbiData {abi: Fastcall, name: "fastcall" },
     AbiData {abi: Aapcs, name: "aapcs" },
     AbiData {abi: Win64, name: "win64" },
 

src/libsyntax/diagnostic.rs

@@ -25,7 +25,7 @@ use term::WriterWrapper;
 use term;
 
 /// maximum number of lines we will print for each error; arbitrary.
-static MAX_LINES: usize = 6;
+const MAX_LINES: usize = 6;
 
 #[derive(Clone, Copy)]
 pub enum RenderSpan {

src/libsyntax/ext/asm.rs

@@ -45,7 +45,7 @@ impl State {
     }
 }
 
-static OPTIONS: &'static [&'static str] = &["volatile", "alignstack", "intel"];
+const OPTIONS: &'static [&'static str] = &["volatile", "alignstack", "intel"];
 
 pub fn expand_asm<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
                        -> Box<base::MacResult+'cx> {

src/libsyntax/feature_gate.rs

@@ -45,7 +45,7 @@ use std::ascii::AsciiExt;
 // stable (active).
 // NB: The featureck.py script parses this information directly out of the source
 // so take care when modifying it.
-static KNOWN_FEATURES: &'static [(&'static str, &'static str, Status)] = &[
+const KNOWN_FEATURES: &'static [(&'static str, &'static str, Status)] = &[
     ("globs", "1.0.0", Accepted),
     ("macro_rules", "1.0.0", Accepted),
     ("struct_variant", "1.0.0", Accepted),
@@ -159,7 +159,7 @@ enum Status {
 }
 
 // Attributes that have a special meaning to rustc or rustdoc
-pub static KNOWN_ATTRIBUTES: &'static [(&'static str, AttributeType)] = &[
+pub const KNOWN_ATTRIBUTES: &'static [(&'static str, AttributeType)] = &[
     // Normal attributes
 
     ("warn", Normal),

src/libsyntax/parse/lexer/comments.rs

@@ -124,8 +124,8 @@ pub fn strip_doc_comment_decoration(comment: &str) -> String {
     }
 
     // one-line comments lose their prefix
-    static ONLINERS: &'static [&'static str] = &["///!", "///", "//!", "//"];
-    for prefix in ONLINERS {
+    const ONELINERS: &'static [&'static str] = &["///!", "///", "//!", "//"];
+    for prefix in ONELINERS {
         if comment.starts_with(*prefix) {
             return (&comment[prefix.len()..]).to_string();
         }

src/libsyntax/parse/token.rs

@@ -425,10 +425,10 @@ macro_rules! declare_special_idents_and_keywords {(
         $( ($rk_name:expr, $rk_variant:ident, $rk_str:expr); )*
     }
 ) => {
-    static STRICT_KEYWORD_START: ast::Name = first!($( ast::Name($sk_name), )*);
-    static STRICT_KEYWORD_FINAL: ast::Name = last!($( ast::Name($sk_name), )*);
-    static RESERVED_KEYWORD_START: ast::Name = first!($( ast::Name($rk_name), )*);
-    static RESERVED_KEYWORD_FINAL: ast::Name = last!($( ast::Name($rk_name), )*);
+    const STRICT_KEYWORD_START: ast::Name = first!($( ast::Name($sk_name), )*);
+    const STRICT_KEYWORD_FINAL: ast::Name = last!($( ast::Name($sk_name), )*);
+    const RESERVED_KEYWORD_START: ast::Name = first!($( ast::Name($rk_name), )*);
+    const RESERVED_KEYWORD_FINAL: ast::Name = last!($( ast::Name($rk_name), )*);
 
     pub mod special_idents {
         use ast;

src/libsyntax/print/pp.rs

@@ -159,7 +159,7 @@ pub struct PrintStackElem {
     pbreak: PrintStackBreak
 }
 
-static SIZE_INFINITY: isize = 0xffff;
+const SIZE_INFINITY: isize = 0xffff;
 
 pub fn mk_printer(out: Box<old_io::Writer+'static>, linewidth: usize) -> Printer {
     // Yes 3, it makes the ring buffers big enough to never