diff --git a/src/librustc/metadata/creader.rs b/src/librustc/metadata/creader.rs
index 5e2ba4156bd..086c6a33b3e 100644
--- a/src/librustc/metadata/creader.rs
+++ b/src/librustc/metadata/creader.rs
@@ -18,7 +18,6 @@ use metadata::decoder;
 use metadata::filesearch::FileSearch;
 use metadata::loader;
 
-use core::either;
 use core::hashmap::linear::LinearMap;
 use core::vec;
 use syntax::attr;
diff --git a/src/librustc/middle/lint.rs b/src/librustc/middle/lint.rs
index 64c6c339179..ba232f55f74 100644
--- a/src/librustc/middle/lint.rs
+++ b/src/librustc/middle/lint.rs
@@ -18,7 +18,6 @@ use util::ppaux::{ty_to_str};
 use core::hashmap::linear::LinearMap;
 use core::char;
 use core::cmp;
-use core::either;
 use core::i8;
 use core::i16;
 use core::i32;
diff --git a/src/librustc/middle/moves.rs b/src/librustc/middle/moves.rs
index 980fb5319f8..a93618b6624 100644
--- a/src/librustc/middle/moves.rs
+++ b/src/librustc/middle/moves.rs
@@ -718,8 +718,8 @@ pub impl VisitContext {
     }
 
     fn use_receiver(&self,
-                    expr_id: node_id,
-                    span: span,
+                    _expr_id: node_id,
+                    _span: span,
                     receiver_expr: @expr,
                     visitor: vt<VisitContext>)
     {
diff --git a/src/librustc/middle/resolve.rs b/src/librustc/middle/resolve.rs
index 5bad8d1d6ca..70d9dfacb69 100644
--- a/src/librustc/middle/resolve.rs
+++ b/src/librustc/middle/resolve.rs
@@ -1358,7 +1358,7 @@ pub impl Resolver {
                                        item_id: def_id,
                                        +parent_privacy: Privacy,
                                        parent: ReducedGraphParent,
-                                       &&visitor: vt<ReducedGraphParent>) {
+                                       &&_visitor: vt<ReducedGraphParent>) {
         let ident = variant.node.name;
         let (child, _) = self.add_child(ident, parent, ForbidDuplicateValues,
                                         variant.span);
diff --git a/src/librustc/middle/trans/consts.rs b/src/librustc/middle/trans/consts.rs
index 2443c9998f1..55e6b30439b 100644
--- a/src/librustc/middle/trans/consts.rs
+++ b/src/librustc/middle/trans/consts.rs
@@ -11,7 +11,7 @@
 use core::prelude::*;
 
 use back::abi;
-use lib::llvm::{llvm, SetLinkage, InternalLinkage, PrivateLinkage,
+use lib::llvm::{llvm, SetLinkage, PrivateLinkage,
                 ValueRef, TypeRef, Bool, True, False};
 use metadata::csearch;
 use middle::const_eval;
diff --git a/src/librustc/middle/trans/foreign.rs b/src/librustc/middle/trans/foreign.rs
index 6a040e81186..7dc2e385e2c 100644
--- a/src/librustc/middle/trans/foreign.rs
+++ b/src/librustc/middle/trans/foreign.rs
@@ -11,7 +11,6 @@
 use core::prelude::*;
 
 use back::{link, abi};
-use driver::session;
 use lib::llvm::{SequentiallyConsistent, Acquire, Release, Xchg};
 use lib::llvm::{TypeRef, ValueRef};
 use lib;
diff --git a/src/librustc/middle/typeck/check/mod.rs b/src/librustc/middle/typeck/check/mod.rs
index 41877017685..056ccf18599 100644
--- a/src/librustc/middle/typeck/check/mod.rs
+++ b/src/librustc/middle/typeck/check/mod.rs
@@ -110,7 +110,6 @@ use util::common::{block_query, indenter, loop_query};
 use util::ppaux::{bound_region_to_str, expr_repr, pat_repr};
 use util::ppaux;
 
-use core::either;
 use core::hashmap::linear::LinearMap;
 use core::ptr;
 use core::result::{Result, Ok, Err};
@@ -119,7 +118,7 @@ use core::str;
 use core::vec;
 use std::list::Nil;
 use syntax::abi::AbiSet;
-use syntax::ast::{provided, required, ty_i};
+use syntax::ast::{provided, required};
 use syntax::ast;
 use syntax::ast_map;
 use syntax::ast_util::local_def;
@@ -3021,7 +3020,7 @@ pub fn check_enum_variants(ccx: @mut CrateCtxt,
                            vs: &[ast::variant],
                            id: ast::node_id) {
     fn do_check(ccx: @mut CrateCtxt,
-                sp: span,
+                _sp: span,
                 vs: &[ast::variant],
                 id: ast::node_id,
                 disr_vals: &mut ~[int],
@@ -3303,7 +3302,7 @@ pub fn type_is_c_like_enum(fcx: @mut FnCtxt, sp: span, typ: ty::t) -> bool {
 
 pub fn ast_expr_vstore_to_vstore(fcx: @mut FnCtxt,
                                  e: @ast::expr,
-                                 n: uint,
+                                 _n: uint,
                                  v: ast::expr_vstore)
                               -> ty::vstore {
     match v {
diff --git a/src/librustc/middle/typeck/collect.rs b/src/librustc/middle/typeck/collect.rs
index 0ef65d5932c..f1d743e79e5 100644
--- a/src/librustc/middle/typeck/collect.rs
+++ b/src/librustc/middle/typeck/collect.rs
@@ -33,7 +33,7 @@ are represented as `ty_param()` instances.
 use core::prelude::*;
 
 use metadata::csearch;
-use middle::ty::{InstantiatedTraitRef, arg};
+use middle::ty::InstantiatedTraitRef;
 use middle::ty::{substs, ty_param_bounds_and_ty, ty_param_substs_and_ty};
 use middle::ty;
 use middle::typeck::astconv::{AstConv, ty_of_arg};
@@ -860,7 +860,7 @@ pub fn ty_of_item(ccx: &CrateCtxt, it: @ast::item)
         tcx.tcache.insert(local_def(it.id), tpt);
         return tpt;
       }
-      ast::item_fn(ref decl, purity, abi, ref generics, _) => {
+      ast::item_fn(ref decl, purity, _, ref generics, _) => {
         let bounds = ty_param_bounds(ccx, generics);
         let tofd = astconv::ty_of_bare_fn(ccx,
                                           &empty_rscope,
diff --git a/src/librustc/middle/typeck/infer/coercion.rs b/src/librustc/middle/typeck/infer/coercion.rs
index 95ff552eb51..43731c6a676 100644
--- a/src/librustc/middle/typeck/infer/coercion.rs
+++ b/src/librustc/middle/typeck/infer/coercion.rs
@@ -66,9 +66,9 @@ we may want to adjust precisely when coercions occur.
 
 use core::prelude::*;
 
-use middle::ty::{TyVar, AutoPtr, AutoBorrowVec, AutoBorrowFn};
-use middle::ty::{AutoAdjustment, AutoDerefRef, AutoRef};
-use middle::ty::{vstore_slice, vstore_box, vstore_uniq, vstore_fixed};
+use middle::ty::{AutoPtr, AutoBorrowVec, AutoBorrowFn};
+use middle::ty::{AutoDerefRef, AutoRef};
+use middle::ty::{vstore_slice, vstore_box, vstore_uniq};
 use middle::ty::{mt};
 use middle::ty;
 use middle::typeck::infer::{CoerceResult, resolve_type};
@@ -76,10 +76,9 @@ use middle::typeck::infer::combine::CombineFields;
 use middle::typeck::infer::sub::Sub;
 use middle::typeck::infer::to_str::InferStr;
 use middle::typeck::infer::resolve::try_resolve_tvar_shallow;
-use util::common::{indent, indenter};
+use util::common::indenter;
 
-use syntax::abi::AbiSet;
-use syntax::ast::{m_const, m_imm, m_mutbl};
+use syntax::ast::m_imm;
 use syntax::ast;
 
 // Note: Coerce is not actually a combiner, in that it does not
diff --git a/src/librustc/middle/typeck/infer/glb.rs b/src/librustc/middle/typeck/infer/glb.rs
index d521d005aba..9c8c8997ae0 100644
--- a/src/librustc/middle/typeck/infer/glb.rs
+++ b/src/librustc/middle/typeck/infer/glb.rs
@@ -21,7 +21,7 @@ use middle::typeck::infer::{cres, InferCtxt};
 use middle::typeck::isr_alist;
 use syntax::ast;
 use syntax::ast::{Many, Once, extern_fn, impure_fn, m_const, m_imm, m_mutbl};
-use syntax::ast::{noreturn, pure_fn, ret_style, return_val, unsafe_fn};
+use syntax::ast::{pure_fn, unsafe_fn};
 use syntax::ast::{Onceness, purity};
 use syntax::abi::AbiSet;
 use syntax::codemap::span;
diff --git a/src/libstd/net_tcp.rs b/src/libstd/net_tcp.rs
index 8a51af8573f..9630351b5c9 100644
--- a/src/libstd/net_tcp.rs
+++ b/src/libstd/net_tcp.rs
@@ -20,7 +20,6 @@ use uv;
 use uv::iotask;
 use uv::iotask::IoTask;
 
-use core::io::{Reader, ReaderUtil, Writer};
 use core::io;
 use core::libc::size_t;
 use core::libc;
@@ -1439,7 +1438,7 @@ struct TcpBufferedSocketData {
     mut buf_off: uint
 }
 
-//#[cfg(test)]
+#[cfg(test)]
 pub mod test {
     use net::ip;
     use net::tcp::{GenericListenErr, TcpConnectErrData, TcpListenErrData};
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 16399674b55..2e7ae4c537a 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -10,7 +10,7 @@
 
 // The Rust abstract syntax tree.
 
-use codemap::{span, FileName, spanned};
+use codemap::{span, spanned};
 use abi::AbiSet;
 use opt_vec::OptVec;
 
diff --git a/src/libsyntax/ast_map.rs b/src/libsyntax/ast_map.rs
index ff5cbbe9f23..f22b466efeb 100644
--- a/src/libsyntax/ast_map.rs
+++ b/src/libsyntax/ast_map.rs
@@ -15,7 +15,6 @@ use ast::*;
 use ast;
 use ast_util::{inlined_item_utils, stmt_id};
 use ast_util;
-use attr;
 use codemap;
 use codemap::spanned;
 use diagnostic::span_handler;
diff --git a/src/libsyntax/attr.rs b/src/libsyntax/attr.rs
index 72355d04456..9f8dbef9b96 100644
--- a/src/libsyntax/attr.rs
+++ b/src/libsyntax/attr.rs
@@ -19,7 +19,6 @@ use codemap::BytePos;
 use diagnostic::span_handler;
 use parse::comments::{doc_comment_style, strip_doc_comment_decoration};
 
-use core::either::Either;
 use core::vec;
 use core::hashmap::linear::LinearSet;
 use std;
diff --git a/src/libsyntax/ext/deriving/mod.rs b/src/libsyntax/ext/deriving/mod.rs
index e2c52fad110..18ebceaeb43 100644
--- a/src/libsyntax/ext/deriving/mod.rs
+++ b/src/libsyntax/ext/deriving/mod.rs
@@ -286,7 +286,7 @@ pub fn create_enum_variant_pattern(cx: @ext_ctxt,
     }
 }
 
-pub fn variant_arg_count(cx: @ext_ctxt, span: span, variant: &variant) -> uint {
+pub fn variant_arg_count(_cx: @ext_ctxt, _span: span, variant: &variant) -> uint {
     match variant.node.kind {
         tuple_variant_kind(ref args) => args.len(),
         struct_variant_kind(ref struct_def) => struct_def.fields.len(),
diff --git a/src/libsyntax/ext/pipes/ast_builder.rs b/src/libsyntax/ext/pipes/ast_builder.rs
index 72e6c22dbc8..1d1a101d61f 100644
--- a/src/libsyntax/ext/pipes/ast_builder.rs
+++ b/src/libsyntax/ext/pipes/ast_builder.rs
@@ -16,7 +16,7 @@
 use core::prelude::*;
 
 use abi::AbiSet;
-use ast::{ident, node_id};
+use ast::ident;
 use ast;
 use ast_util;
 use codemap::{span, respan, dummy_sp, spanned};
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 353e3014cf7..ceafecde3a0 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -3777,7 +3777,7 @@ pub impl Parser {
         };
     }
 
-    fn parse_enum_def(&self, generics: &ast::Generics) -> enum_def {
+    fn parse_enum_def(&self, _generics: &ast::Generics) -> enum_def {
         let mut variants = ~[];
         let mut all_nullary = true, have_disr = false;
         while *self.token != token::RBRACE {
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index 0ec7bdba3d1..0c79cbca039 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -11,7 +11,6 @@
 use core::prelude::*;
 
 use abi::AbiSet;
-use abi;
 use ast::{RegionTyParamBound, TraitTyParamBound, required, provided};
 use ast;
 use ast_util;
@@ -2180,7 +2179,7 @@ pub fn print_opt_sigil(s: @ps, opt_sigil: Option<ast::Sigil>) {
 }
 
 pub fn print_fn_header_info(s: @ps,
-                            opt_sty: Option<ast::self_ty_>,
+                            _opt_sty: Option<ast::self_ty_>,
                             opt_purity: Option<ast::purity>,
                             abis: AbiSet,
                             onceness: ast::Onceness,