libsyntax: Remove the `use foo = bar` syntax from the language in favor

of `use bar as foo`.

Change all uses of `use foo = bar` to `use bar as foo`.

Implements RFC #47.

Closes #16461.

[breaking-change]

src/doc/rust.md

@@ -1801,7 +1801,7 @@ module through the rules above. It essentially allows public access into the
 re-exported item. For example, this program is valid:
 
 ~~~~
-pub use api = self::implementation;
+pub use self::implementation as api;
 
 mod implementation {
     pub fn f() {}

src/doc/tutorial.md

@@ -3112,7 +3112,7 @@ use farm::*;
 However, that's not all. You can also rename an item while you're bringing it into scope:
 
 ~~~
-use egg_layer = farm::chicken;
+use farm::chicken as egg_layer;
 # mod farm { pub fn chicken() { println!("Laying eggs is fun!")  } }
 // ...
 
@@ -3335,7 +3335,7 @@ you just have to import it with an `use` statement.
 For example, it re-exports `range` which is defined in `std::iter::range`:
 
 ~~~
-use iter_range = std::iter::range;
+use std::iter::range as iter_range;
 
 fn main() {
     // `range` is imported by default

src/liballoc/lib.rs

@@ -86,7 +86,7 @@
 
 #[deprecated = "use boxed instead"]
 #[cfg(not(test))]
-pub use owned = boxed;
+pub use boxed as owned;
 
 // Heaps provided for low-level allocation strategies
 

src/libcollections/hash/mod.rs

@@ -73,7 +73,7 @@
 use vec::Vec;
 
 /// Reexport the `sip::hash` function as our default hasher.
-pub use hash = self::sip::hash;
+pub use self::sip::hash as hash;
 
 pub mod sip;
 

src/libcollections/string.rs

@@ -19,13 +19,13 @@
 use core::mem;
 use core::ptr;
 // FIXME: ICE's abound if you import the `Slice` type while importing `Slice` trait
-use RawSlice = core::raw::Slice;
+use core::raw::Slice as RawSlice;
 
 use {Mutable, MutableSeq};
 use hash;
 use str;
 use str::{CharRange, StrAllocating, MaybeOwned, Owned};
-use MaybeOwnedSlice = str::Slice; // So many `Slice`s...
+use str::Slice as MaybeOwnedSlice; // So many `Slice`s...
 use vec::Vec;
 
 /// A growable string stored as a UTF-8 encoded buffer.

src/libcollections/vec.rs

@@ -13,13 +13,13 @@
 use core::prelude::*;
 
 use alloc::heap::{allocate, reallocate, deallocate};
-use RawSlice = core::raw::Slice;
 use core::cmp::max;
 use core::default::Default;
 use core::fmt;
 use core::mem;
 use core::num;
 use core::ptr;
+use core::raw::Slice as RawSlice;
 use core::uint;
 
 use {Mutable, MutableSeq};

src/libcore/kinds.rs

@@ -21,7 +21,7 @@
 */
 
 #[deprecated = "This has been renamed to Sync"]
-pub use Share = self::Sync;
+pub use self::Sync as Share;
 
 /// Types able to be transferred across task boundaries.
 #[lang="send"]

src/libcore/lib.rs

@@ -107,7 +107,7 @@
 /// Deprecated module in favor of `std::cell`
 pub mod ty {
     #[deprecated = "this type has been renamed to `UnsafeCell`"]
-    pub use Unsafe = cell::UnsafeCell;
+    pub use cell::UnsafeCell as Unsafe;
 }
 
 /* Core types and methods on primitives */

src/libcore/slice.rs

@@ -50,7 +50,7 @@
 use kinds::marker;
 use raw::Repr;
 // Avoid conflicts with *both* the Slice trait (buggy) and the `slice::raw` module.
-use RawSlice = raw::Slice;
+use raw::Slice as RawSlice;
 
 
 //

src/libgraphviz/lib.rs

@@ -47,7 +47,7 @@
 which is cyclic.
 
 ```rust
-use dot = graphviz;
+use graphviz as dot;
 use graphviz::maybe_owned_vec::IntoMaybeOwnedVector;
 
 type Nd = int;
@@ -147,7 +147,7 @@ pub fn main() {
 entity `&sube`).
 
 ```rust
-use dot = graphviz;
+use graphviz as dot;
 use std::str;
 
 type Nd = uint;
@@ -203,7 +203,7 @@ pub fn main() {
 Hasse-diagram for the subsets of the set `{x, y}`.
 
 ```rust
-use dot = graphviz;
+use graphviz as dot;
 use std::str;
 
 type Nd<'a> = (uint, &'a str);

src/libgreen/message_queue.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 use alloc::arc::Arc;
-use mpsc = std::sync::mpsc_queue;
+use std::sync::mpsc_queue as mpsc;
 use std::kinds::marker;
 
 pub enum PopResult<T> {

src/libgreen/sched.rs

@@ -25,7 +25,7 @@
 use sleeper_list::SleeperList;
 use stack::StackPool;
 use task::{TypeSched, GreenTask, HomeSched, AnySched};
-use msgq = message_queue;
+use message_queue as msgq;
 
 /// A scheduler is responsible for coordinating the execution of Tasks
 /// on a single thread. The scheduler runs inside a slightly modified

src/libnative/io/mod.rs

@@ -79,8 +79,8 @@
 #[cfg(windows)] #[path = "c_win32.rs"] mod c;
 
 fn unimpl() -> IoError {
-    #[cfg(unix)] use ERROR = libc::ENOSYS;
-    #[cfg(windows)] use ERROR = libc::ERROR_CALL_NOT_IMPLEMENTED;
+    #[cfg(unix)] use libc::ENOSYS as ERROR;
+    #[cfg(windows)] use libc::ERROR_CALL_NOT_IMPLEMENTED as ERROR;
     IoError {
         code: ERROR as uint,
         extra: 0,

src/libnative/io/net.rs

@@ -210,8 +210,8 @@ pub fn sockaddr_to_addr(storage: &libc::sockaddr_storage,
             })
         }
         _ => {
-            #[cfg(unix)] use ERROR = libc::EINVAL;
-            #[cfg(windows)] use ERROR = libc::WSAEINVAL;
+            #[cfg(unix)] use libc::EINVAL as ERROR;
+            #[cfg(windows)] use libc::WSAEINVAL as ERROR;
             Err(IoError {
                 code: ERROR as uint,
                 extra: 0,

src/libnative/io/pipe_unix.rs

@@ -39,8 +39,8 @@ fn addr_to_sockaddr_un(addr: &CString,
 
     let len = addr.len();
     if len > s.sun_path.len() - 1 {
-        #[cfg(unix)] use ERROR = libc::EINVAL;
-        #[cfg(windows)] use ERROR = libc::WSAEINVAL;
+        #[cfg(unix)] use libc::EINVAL as ERROR;
+        #[cfg(windows)] use libc::WSAEINVAL as ERROR;
         return Err(IoError {
             code: ERROR as uint,
             extra: 0,

src/libnative/io/process.rs

@@ -148,8 +148,8 @@ fn wait(&mut self) -> IoResult<rtio::ProcessExit> {
     }
 
     fn kill(&mut self, signum: int) -> IoResult<()> {
-        #[cfg(unix)] use ERROR = libc::EINVAL;
-        #[cfg(windows)] use ERROR = libc::ERROR_NOTHING_TO_TERMINATE;
+        #[cfg(unix)] use libc::EINVAL as ERROR;
+        #[cfg(windows)] use libc::ERROR_NOTHING_TO_TERMINATE as ERROR;
 
         // On linux (and possibly other unices), a process that has exited will
         // continue to accept signals because it is "defunct". The delivery of
@@ -192,8 +192,8 @@ fn drop(&mut self) {
 }
 
 fn pipe() -> IoResult<(file::FileDesc, file::FileDesc)> {
-    #[cfg(unix)] use ERROR = libc::EMFILE;
-    #[cfg(windows)] use ERROR = libc::WSAEMFILE;
+    #[cfg(unix)] use libc::EMFILE as ERROR;
+    #[cfg(windows)] use libc::WSAEMFILE as ERROR;
     struct Closer { fd: libc::c_int }
 
     let os::Pipe { reader, writer } = match unsafe { os::pipe() } {

src/libnative/io/util.rs

@@ -25,8 +25,8 @@ pub enum SocketStatus {
 }
 
 pub fn timeout(desc: &'static str) -> IoError {
-    #[cfg(unix)] use ERROR = libc::ETIMEDOUT;
-    #[cfg(windows)] use ERROR = libc::ERROR_OPERATION_ABORTED;
+    #[cfg(unix)] use libc::ETIMEDOUT as ERROR;
+    #[cfg(windows)] use libc::ERROR_OPERATION_ABORTED as ERROR;
     IoError {
         code: ERROR as uint,
         extra: 0,
@@ -35,8 +35,8 @@ pub fn timeout(desc: &'static str) -> IoError {
 }
 
 pub fn short_write(n: uint, desc: &'static str) -> IoError {
-    #[cfg(unix)] use ERROR = libc::EAGAIN;
-    #[cfg(windows)] use ERROR = libc::ERROR_OPERATION_ABORTED;
+    #[cfg(unix)] use libc::EAGAIN as ERROR;
+    #[cfg(windows)] use libc::ERROR_OPERATION_ABORTED as ERROR;
     IoError {
         code: ERROR as uint,
         extra: n,
@@ -102,10 +102,10 @@ pub fn connect_timeout(fd: net::sock_t,
                        len: libc::socklen_t,
                        timeout_ms: u64) -> IoResult<()> {
     use std::os;
-    #[cfg(unix)]    use INPROGRESS = libc::EINPROGRESS;
-    #[cfg(windows)] use INPROGRESS = libc::WSAEINPROGRESS;
-    #[cfg(unix)]    use WOULDBLOCK = libc::EWOULDBLOCK;
-    #[cfg(windows)] use WOULDBLOCK = libc::WSAEWOULDBLOCK;
+    #[cfg(unix)]    use libc::EINPROGRESS as INPROGRESS;
+    #[cfg(windows)] use libc::WSAEINPROGRESS as INPROGRESS;
+    #[cfg(unix)]    use libc::EWOULDBLOCK as WOULDBLOCK;
+    #[cfg(windows)] use libc::WSAEWOULDBLOCK as WOULDBLOCK;
 
     // Make sure the call to connect() doesn't block
     try!(set_nonblocking(fd, true));

src/librustc/driver/driver.rs

@@ -21,7 +21,7 @@
 use metadata::creader;
 use middle::borrowck::{FnPartsWithCFG};
 use middle::borrowck;
-use borrowck_dot = middle::borrowck::graphviz;
+use middle::borrowck::graphviz as borrowck_dot;
 use middle::cfg;
 use middle::cfg::graphviz::LabelledCFG;
 use middle::{trans, freevars, stability, kind, ty, typeck, reachable};
@@ -35,7 +35,7 @@
 use util::ppaux;
 use util::nodemap::{NodeSet};
 
-use dot = graphviz;
+use graphviz as dot;
 
 use serialize::{json, Encodable};
 

src/librustc/metadata/filesearch.rs

@@ -16,7 +16,7 @@
 use std::dynamic_lib::DynamicLibrary;
 use std::collections::HashSet;
 
-use myfs = util::fs;
+use util::fs as myfs;
 
 pub enum FileMatch { FileMatches, FileDoesntMatch }
 

src/librustc/middle/astencode.rs

@@ -12,18 +12,18 @@
 // FIXME: remove this after snapshot, and Results are handled
 #![allow(unused_must_use)]
 
-use c = metadata::common;
-use cstore = metadata::cstore;
+use metadata::common as c;
+use metadata::cstore as cstore;
 use driver::session::Session;
 use metadata::decoder;
 use middle::def;
-use e = metadata::encoder;
+use metadata::encoder as e;
 use middle::freevars::{CaptureMode, freevar_entry};
 use middle::freevars;
 use middle::region;
 use metadata::tydecode;
-use metadata::tydecode::{DefIdSource, NominalType, TypeWithId, TypeParameter,
-                         RegionParameter};
+use metadata::tydecode::{DefIdSource, NominalType, TypeWithId, TypeParameter};
+use metadata::tydecode::{RegionParameter};
 use metadata::tyencode;
 use middle::subst;
 use middle::subst::VecPerParamSpace;

src/librustc/middle/borrowck/check_loans.rs

@@ -19,8 +19,8 @@
 
 
 use middle::borrowck::*;
-use euv = middle::expr_use_visitor;
-use mc = middle::mem_categorization;
+use middle::expr_use_visitor as euv;
+use middle::mem_categorization as mc;
 use middle::ty;
 use syntax::ast;
 use syntax::codemap::Span;

src/librustc/middle/borrowck/gather_loans/gather_moves.rs

@@ -12,12 +12,12 @@
  * Computes moves.
  */
 
-use mc = middle::mem_categorization;
 use middle::borrowck::*;
-use middle::borrowck::gather_loans::move_error::{MoveError, MoveErrorCollector};
 use middle::borrowck::gather_loans::move_error::MoveSpanAndPath;
+use middle::borrowck::gather_loans::move_error::{MoveError, MoveErrorCollector};
 use middle::borrowck::move_data::*;
-use euv = middle::expr_use_visitor;
+use middle::expr_use_visitor as euv;
+use middle::mem_categorization as mc;
 use middle::ty;
 use syntax::ast;
 use syntax::codemap::Span;

src/librustc/middle/borrowck/gather_loans/lifetime.rs

@@ -14,8 +14,8 @@
  */
 
 use middle::borrowck::*;
-use euv = middle::expr_use_visitor;
-use mc = middle::mem_categorization;
+use middle::expr_use_visitor as euv;
+use middle::mem_categorization as mc;
 use middle::ty;
 use util::ppaux::Repr;
 use syntax::ast;

src/librustc/middle/borrowck/gather_loans/mod.rs

@@ -18,8 +18,8 @@
 
 use middle::borrowck::*;
 use middle::borrowck::move_data::MoveData;
-use euv = middle::expr_use_visitor;
-use mc = middle::mem_categorization;
+use middle::expr_use_visitor as euv;
+use middle::mem_categorization as mc;
 use middle::ty;
 use util::ppaux::{Repr};
 

src/librustc/middle/borrowck/gather_loans/move_error.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use mc = middle::mem_categorization;
+use middle::mem_categorization as mc;
 use middle::borrowck::BorrowckCtxt;
 use middle::ty;
 

src/librustc/middle/borrowck/gather_loans/restrictions.rs

@@ -13,8 +13,8 @@
  */
 
 use middle::borrowck::*;
-use euv = middle::expr_use_visitor;
-use mc = middle::mem_categorization;
+use middle::expr_use_visitor as euv;
+use middle::mem_categorization as mc;
 use middle::ty;
 use syntax::codemap::Span;
 use util::ppaux::Repr;

src/librustc/middle/borrowck/graphviz.rs

@@ -13,9 +13,9 @@
 //! data to rendered labels.
 
 /// For clarity, rename the graphviz crate locally to dot.
-use dot = graphviz;
+use graphviz as dot;
 pub use middle::cfg::graphviz::{Node, Edge};
-use cfg_dot = middle::cfg::graphviz;
+use middle::cfg::graphviz as cfg_dot;
 
 use middle::borrowck;
 use middle::borrowck::{BorrowckCtxt, LoanPath};

src/librustc/middle/borrowck/mod.rs

@@ -17,8 +17,8 @@
 use middle::dataflow::BitwiseOperator;
 use middle::dataflow::DataFlowOperator;
 use middle::def;
-use euv = middle::expr_use_visitor;
-use mc = middle::mem_categorization;
+use middle::expr_use_visitor as euv;
+use middle::mem_categorization as mc;
 use middle::ty;
 use util::ppaux::{note_and_explain_region, Repr, UserString};
 

src/librustc/middle/borrowck/move_data.rs

@@ -24,8 +24,8 @@
 use middle::dataflow::DataFlowContext;
 use middle::dataflow::BitwiseOperator;
 use middle::dataflow::DataFlowOperator;
-use euv = middle::expr_use_visitor;
-use mc = middle::mem_categorization;
+use middle::expr_use_visitor as euv;
+use middle::mem_categorization as mc;
 use middle::ty;
 use syntax::ast;
 use syntax::ast_util;

src/librustc/middle/cfg/graphviz.rs

@@ -12,7 +12,7 @@
 /// libgraphviz traits.
 
 /// For clarity, rename the graphviz crate locally to dot.
-use dot = graphviz;
+use graphviz as dot;
 
 use syntax::ast;
 use syntax::ast_map;

src/librustc/middle/expr_use_visitor.rs

@@ -14,7 +14,7 @@
  * `ExprUseVisitor` determines how expressions are being used.
  */
 
-use mc = middle::mem_categorization;
+use middle::mem_categorization as mc;
 use middle::def;
 use middle::freevars;
 use middle::pat_util;

src/librustc/middle/trans/_match.rs

@@ -189,16 +189,16 @@
 #![allow(non_camel_case_types)]
 
 use back::abi;
-use mc = middle::mem_categorization;
 use driver::config::FullDebugInfo;
-use euv = middle::expr_use_visitor;
-use llvm;
 use llvm::{ValueRef, BasicBlockRef};
+use llvm;
+use middle::check_match::StaticInliner;
+use middle::check_match;
 use middle::const_eval;
 use middle::def;
-use middle::check_match;
-use middle::check_match::StaticInliner;
+use middle::expr_use_visitor as euv;
 use middle::lang_items::StrEqFnLangItem;
+use middle::mem_categorization as mc;
 use middle::pat_util::*;
 use middle::resolve::DefMap;
 use middle::trans::adt;

src/librustc/middle/trans/callee.rs

@@ -53,9 +53,9 @@
 use util::ppaux::Repr;
 
 use std::gc::Gc;
+use syntax::abi as synabi;
 use syntax::ast;
 use syntax::ast_map;
-use synabi = syntax::abi;
 
 pub struct MethodData {
     pub llfn: ValueRef,

src/librustc/middle/trans/common.rs

@@ -16,10 +16,10 @@
 use llvm;
 use llvm::{ValueRef, BasicBlockRef, BuilderRef};
 use llvm::{True, False, Bool};
-use mc = middle::mem_categorization;
 use middle::def;
 use middle::freevars;
 use middle::lang_items::LangItem;
+use middle::mem_categorization as mc;
 use middle::subst;
 use middle::subst::Subst;
 use middle::trans::base;

src/librustc/middle/ty.rs

@@ -12,9 +12,8 @@
 
 use back::svh::Svh;
 use driver::session::Session;
-use metadata::csearch;
-use mc = middle::mem_categorization;
 use lint;
+use metadata::csearch;
 use middle::const_eval;
 use middle::def;
 use middle::dependency_format;
@@ -22,6 +21,7 @@
 use middle::freevars;
 use middle::lang_items::{FnMutTraitLangItem, OpaqueStructLangItem};
 use middle::lang_items::{TyDescStructLangItem, TyVisitorTraitLangItem};
+use middle::mem_categorization as mc;
 use middle::resolve;
 use middle::resolve_lifetime;
 use middle::stability;

src/librustc/middle/typeck/astconv.rs

@@ -53,15 +53,15 @@
 use middle::def;
 use middle::lang_items::{FnTraitLangItem, FnMutTraitLangItem};
 use middle::lang_items::{FnOnceTraitLangItem};
+use middle::resolve_lifetime as rl;
 use middle::subst::{FnSpace, TypeSpace, SelfSpace, Subst, Substs};
 use middle::subst::{VecPerParamSpace};
 use middle::ty;
 use middle::ty_fold::TypeFolder;
-use middle::typeck::rscope::{ExplicitRscope, ImpliedSingleRscope};
 use middle::typeck::rscope::RegionScope;
+use middle::typeck::rscope::{ExplicitRscope, ImpliedSingleRscope};
 use middle::typeck::{TypeAndSubsts, infer, lookup_def_tcx, rscope};
 use middle::typeck;
-use rl = middle::resolve_lifetime;
 use util::ppaux::Repr;
 
 use std::rc::Rc;

src/librustc/middle/typeck/check/regionck.rs

@@ -121,7 +121,7 @@ fn get_i(x: &'a Bar) -> &'a int {
 use middle::def;
 use middle::def::{DefArg, DefBinding, DefLocal, DefUpvar};
 use middle::freevars;
-use mc = middle::mem_categorization;
+use middle::mem_categorization as mc;
 use middle::ty::{ReScope};
 use middle::ty;
 use middle::typeck::astconv::AstConv;

src/librustc/middle/typeck/variance.rs

@@ -195,7 +195,7 @@ enum OptionalMap<C> { Some(|C| -> C), None }
 use std::collections::HashMap;
 use arena;
 use arena::Arena;
-use rl = middle::resolve_lifetime;
+use middle::resolve_lifetime as rl;
 use middle::subst;
 use middle::subst::{ParamSpace, FnSpace, TypeSpace, SelfSpace, VecPerParamSpace};
 use middle::ty;

src/librustc/util/ppaux.rs

@@ -10,27 +10,27 @@
 
 
 use middle::def;
-use middle::subst;
 use middle::subst::{VecPerParamSpace,Subst};
-use middle::ty::{ReSkolemized, ReVar};
+use middle::subst;
 use middle::ty::{BoundRegion, BrAnon, BrNamed};
 use middle::ty::{ReEarlyBound, BrFresh, ctxt};
-use middle::ty::{mt, t, ParamTy};
 use middle::ty::{ReFree, ReScope, ReInfer, ReStatic, Region, ReEmpty};
+use middle::ty::{ReSkolemized, ReVar};
+use middle::ty::{mt, t, ParamTy};
 use middle::ty::{ty_bool, ty_char, ty_bot, ty_box, ty_struct, ty_enum};
 use middle::ty::{ty_err, ty_str, ty_vec, ty_float, ty_bare_fn, ty_closure};
 use middle::ty::{ty_nil, ty_param, ty_ptr, ty_rptr, ty_tup};
-use middle::ty::{ty_uniq, ty_trait, ty_int, ty_uint, ty_infer};
 use middle::ty::{ty_unboxed_closure};
+use middle::ty::{ty_uniq, ty_trait, ty_int, ty_uint, ty_infer};
 use middle::ty;
-use middle::typeck;
-use middle::typeck::infer;
-use middle::typeck::infer::unify;
-use VV = middle::typeck::infer::unify::VarValue;
 use middle::typeck::infer::region_inference;
+use middle::typeck::infer::unify::VarValue as VV;
+use middle::typeck::infer::unify;
+use middle::typeck::infer;
+use middle::typeck;
 
-use std::rc::Rc;
 use std::gc::Gc;
+use std::rc::Rc;
 use syntax::abi;
 use syntax::ast_map;
 use syntax::codemap::{Span, Pos};

src/librustc_back/archive.rs

@@ -16,7 +16,7 @@
 use std::os;
 use std::str;
 use syntax::abi;
-use ErrorHandler = syntax::diagnostic::Handler;
+use syntax::diagnostic::Handler as ErrorHandler;
 
 pub static METADATA_FILENAME: &'static str = "rust.metadata.bin";
 

src/librustdoc/html/format.rs

@@ -545,7 +545,7 @@ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                 if *name == src.path.segments.last().unwrap().name {
                     write!(f, "use {};", *src)
                 } else {
-                    write!(f, "use {} = {};", *name, *src)
+                    write!(f, "use {} as {};", *src, *name)
                 }
             }
             clean::GlobImport(ref src) => {

src/librustdoc/html/highlight.rs

@@ -13,14 +13,12 @@
 //! This module uses libsyntax's lexer to provide token-based highlighting for
 //! the HTML documentation generated by rustdoc.
 
-use std::io;
-
-use syntax::parse;
-use syntax::parse::lexer;
-
 use html::escape::Escape;
 
-use t = syntax::parse::token;
+use std::io;
+use syntax::parse::lexer;
+use syntax::parse::token as t;
+use syntax::parse;
 
 /// Highlights some source code, returning the HTML output.
 pub fn highlight(src: &str, class: Option<&str>, id: Option<&str>) -> String {

src/librustdoc/plugins.rs

@@ -10,7 +10,7 @@
 
 use clean;
 
-use dl = std::dynamic_lib;
+use std::dynamic_lib as dl;
 use serialize::json;
 use std::mem;
 use std::string::String;

src/librustrt/local_ptr.rs

@@ -240,7 +240,7 @@ pub mod native {
     use alloc::boxed::Box;
     use core::mem;
     use core::ptr;
-    use tls = thread_local_storage;
+    use thread_local_storage as tls;
 
     static mut RT_TLS_KEY: tls::Key = -1;
 

src/librustrt/rtio.rs

@@ -162,8 +162,8 @@ pub fn borrow() -> Option<LocalIo<'a>> {
     pub fn maybe_raise<T>(f: |io: &mut IoFactory| -> IoResult<T>)
         -> IoResult<T>
     {
-        #[cfg(unix)] use ERROR = libc::EINVAL;
-        #[cfg(windows)] use ERROR = libc::ERROR_CALL_NOT_IMPLEMENTED;
+        #[cfg(unix)] use libc::EINVAL as ERROR;
+        #[cfg(windows)] use libc::ERROR_CALL_NOT_IMPLEMENTED as ERROR;
         match LocalIo::borrow() {
             Some(mut io) => f(io.get()),
             None => Err(IoError {

src/librustrt/unwind.rs

@@ -74,7 +74,7 @@
 use local::Local;
 use task::Task;
 
-use uw = libunwind;
+use libunwind as uw;
 
 pub struct Unwinder {
     unwinding: bool,
@@ -238,7 +238,7 @@ fn rust_exception_class() -> uw::_Unwind_Exception_Class {
 #[doc(hidden)]
 #[allow(visible_private_types)]
 pub mod eabi {
-    use uw = libunwind;
+    use libunwind as uw;
     use libc::c_int;
 
     extern "C" {
@@ -292,7 +292,7 @@ pub extern "C" fn rust_eh_personality_catch(
 #[doc(hidden)]
 #[allow(visible_private_types)]
 pub mod eabi {
-    use uw = libunwind;
+    use libunwind as uw;
     use libc::c_int;
 
     extern "C" {
@@ -345,7 +345,7 @@ pub extern "C" fn rust_eh_personality_catch(
 #[doc(hidden)]
 #[allow(visible_private_types)]
 pub mod eabi {
-    use uw = libunwind;
+    use libunwind as uw;
     use libc::c_int;
 
     extern "C" {
@@ -396,7 +396,7 @@ pub extern "C" fn rust_eh_personality_catch(
 #[allow(visible_private_types)]
 #[allow(non_camel_case_types)]
 pub mod eabi {
-    use uw = libunwind;
+    use libunwind as uw;
     use libc::{c_void, c_int};
 
     struct EXCEPTION_RECORD;

src/librustuv/queue.rs

@@ -25,7 +25,7 @@
 use std::mem;
 use std::rt::mutex::NativeMutex;
 use std::rt::task::BlockedTask;
-use mpsc = std::sync::mpsc_queue;
+use std::sync::mpsc_queue as mpsc;
 
 use async::AsyncWatcher;
 use super::{Loop, UvHandle};

src/libstd/ascii.rs

@@ -27,10 +27,10 @@
 use vec::Vec;
 
 #[deprecated="this trait has been renamed to `AsciiExt`"]
-pub use StrAsciiExt = self::AsciiExt;
+pub use self::AsciiExt as StrAsciiExt;
 
 #[deprecated="this trait has been renamed to `OwnedAsciiExt`"]
-pub use OwnedStrAsciiExt = self::OwnedAsciiExt;
+pub use self::OwnedAsciiExt as OwnedStrAsciiExt;
 
 
 /// Datatype to hold one ascii character. It wraps a `u8`, with the highest bit always zero.

src/libstd/lib.rs

@@ -175,7 +175,7 @@
 
 pub use alloc::boxed;
 #[deprecated = "use boxed instead"]
-pub use owned = boxed;
+pub use boxed as owned;
 
 pub use alloc::rc;
 
@@ -289,7 +289,7 @@ mod std {
     pub use vec; // used for vec![]
 
     // The test runner calls ::std::os::args() but really wants realstd
-    #[cfg(test)] pub use os = realstd::os;
+    #[cfg(test)] pub use realstd::os as os;
     // The test runner requires std::slice::Vector, so re-export std::slice just for it.
     #[cfg(test)] pub use slice;
 

src/libstd/path/mod.rs

@@ -80,59 +80,59 @@
 
 /// Typedef for POSIX file paths.
 /// See `posix::Path` for more info.
-pub use PosixPath = self::posix::Path;
+pub use self::posix::Path as PosixPath;
 
 /// Typedef for Windows file paths.
 /// See `windows::Path` for more info.
-pub use WindowsPath = self::windows::Path;
+pub use self::windows::Path as WindowsPath;
 
 /// Typedef for the platform-native path type
 #[cfg(unix)]
-pub use Path = self::posix::Path;
+pub use self::posix::Path as Path;
 /// Typedef for the platform-native path type
 #[cfg(windows)]
-pub use Path = self::windows::Path;
+pub use self::windows::Path as Path;
 
 /// Typedef for the platform-native component iterator
 #[cfg(unix)]
-pub use Components = self::posix::Components;
+pub use self::posix::Components as Components;
 /// Typedef for the platform-native component iterator
 #[cfg(windows)]
-pub use Components = self::windows::Components;
+pub use self::windows::Components as Components;
 
 /// Typedef for the platform-native str component iterator
 #[cfg(unix)]
-pub use StrComponents = self::posix::StrComponents;
+pub use self::posix::StrComponents as StrComponents;
 /// Typedef for the platform-native str component iterator
 #[cfg(windows)]
-pub use StrComponents = self::windows::StrComponents;
+pub use self::windows::StrComponents as StrComponents;
 
 /// Alias for the platform-native separator character.
 #[cfg(unix)]
-pub use SEP = self::posix::SEP;
+pub use self::posix::SEP as SEP;
 /// Alias for the platform-native separator character.
 #[cfg(windows)]
-pub use SEP = self::windows::SEP;
+pub use self::windows::SEP as SEP;
 
 /// Alias for the platform-native separator byte.
 #[cfg(unix)]
-pub use SEP_BYTE = self::posix::SEP_BYTE;
+pub use self::posix::SEP_BYTE as SEP_BYTE;
 /// Alias for the platform-native separator byte.
 #[cfg(windows)]
-pub use SEP_BYTE = self::windows::SEP_BYTE;
+pub use self::windows::SEP_BYTE as SEP_BYTE;
 
 /// Typedef for the platform-native separator char func
 #[cfg(unix)]
-pub use is_sep = self::posix::is_sep;
+pub use self::posix::is_sep as is_sep;
 /// Typedef for the platform-native separator char func
 #[cfg(windows)]
-pub use is_sep = self::windows::is_sep;
+pub use self::windows::is_sep as is_sep;
 /// Typedef for the platform-native separator byte func
 #[cfg(unix)]
-pub use is_sep_byte = self::posix::is_sep_byte;
+pub use self::posix::is_sep_byte as is_sep_byte;
 /// Typedef for the platform-native separator byte func
 #[cfg(windows)]
-pub use is_sep_byte = self::windows::is_sep_byte;
+pub use self::windows::is_sep_byte as is_sep_byte;
 
 pub mod posix;
 pub mod windows;

src/libstd/rand/mod.rs

@@ -185,9 +185,9 @@
 use vec::Vec;
 
 #[cfg(not(target_word_size="64"))]
-use IsaacWordRng = core_rand::IsaacRng;
+use core_rand::IsaacRng as IsaacWordRng;
 #[cfg(target_word_size="64")]
-use IsaacWordRng = core_rand::Isaac64Rng;
+use core_rand::Isaac64Rng as IsaacWordRng;
 
 pub use core_rand::{Rand, Rng, SeedableRng, Open01, Closed01};
 pub use core_rand::{XorShiftRng, IsaacRng, Isaac64Rng};

src/libstd/sync/mod.rs

@@ -27,7 +27,7 @@
 pub use core_sync::one::{Once, ONCE_INIT};
 
 #[deprecated = "use atomic instead"]
-pub use atomics = core_sync::atomic;
+pub use core_sync::atomic as atomics;
 
 pub use self::future::Future;
 pub use self::task_pool::TaskPool;

src/libsync/comm/shared.rs

@@ -29,7 +29,7 @@
 use rustrt::thread::Thread;
 
 use atomic;
-use mpsc = mpsc_queue;
+use mpsc_queue as mpsc;
 
 static DISCONNECTED: int = int::MIN;
 static FUDGE: int = 1024;

src/libsync/comm/stream.rs

@@ -28,7 +28,7 @@
 
 use atomic;
 use comm::Receiver;
-use spsc = spsc_queue;
+use spsc_queue as spsc;
 
 static DISCONNECTED: int = int::MIN;
 #[cfg(test)]

src/libsync/mutex.rs

@@ -68,7 +68,7 @@
 use rustrt::task::{BlockedTask, Task};
 use rustrt::thread::Thread;
 
-use q = mpsc_intrusive;
+use mpsc_intrusive as q;
 
 pub static LOCKED: uint = 1 << 0;
 pub static GREEN_BLOCKED: uint = 1 << 1;

src/libsyntax/ext/format.rs

@@ -14,10 +14,10 @@
 use ext::base::*;
 use ext::base;
 use ext::build::AstBuilder;
+use fmt_macros as parse;
 use parse::token::InternedString;
 use parse::token;
 
-use parse = fmt_macros;
 use std::collections::HashMap;
 use std::gc::{Gc, GC};
 

src/libsyntax/parse/mod.rs

@@ -328,7 +328,7 @@ fn filemap_to_tts(sess: &ParseSess, filemap: Rc<FileMap>)
                       -> Vec<ast::TokenTree> {
         // it appears to me that the cfg doesn't matter here... indeed,
         // parsing tt's probably shouldn't require a parser at all.
-        use make_reader = super::lexer::make_reader_with_embedded_idents;
+        use super::lexer::make_reader_with_embedded_idents as make_reader;
         let cfg = Vec::new();
         let srdr = make_reader(&sess.span_diagnostic, filemap);
         let mut p1 = Parser::new(sess, cfg, box srdr);

src/libsyntax/parse/obsolete.rs

@@ -34,6 +34,7 @@ pub enum ObsoleteSyntax {
     ObsoleteOwnedSelf,
     ObsoleteManagedType,
     ObsoleteManagedExpr,
+    ObsoleteImportRenaming,
 }
 
 pub trait ParserObsoleteMethods {
@@ -83,6 +84,10 @@ fn obsolete(&mut self, sp: Span, kind: ObsoleteSyntax) {
                 "`@` notation for a managed pointer allocation",
                 "use the `box(GC)` operator instead of `@`"
             ),
+            ObsoleteImportRenaming => (
+                "`use foo = bar` syntax",
+                "write `use bar as foo` instead"
+            )
         };
 
         self.report(sp, kind, kind_str, desc);

src/libsyntax/parse/parser.rs

@@ -5385,7 +5385,6 @@ fn parse_view_path(&mut self) -> Gc<ViewPath> {
         match self.token {
           token::EQ => {
             // x = foo::bar
-            // NOTE(stage0, #16461, pcwalton): Deprecate after snapshot.
             self.bump();
             let path_lo = self.span.lo;
             path = vec!(self.parse_ident());
@@ -5394,8 +5393,10 @@ fn parse_view_path(&mut self) -> Gc<ViewPath> {
                 let id = self.parse_ident();
                 path.push(id);
             }
+            let span = mk_sp(path_lo, self.span.hi);
+            self.obsolete(span, ObsoleteImportRenaming);
             let path = ast::Path {
-                span: mk_sp(path_lo, self.span.hi),
+                span: span,
                 global: false,
                 segments: path.move_iter().map(|identifier| {
                     ast::PathSegment {

src/libunicode/u_str.rs

@@ -225,7 +225,7 @@ fn size_hint(&self) -> (uint, Option<uint>) {
 
     #[inline]
     fn next(&mut self) -> Option<&'a str> {
-        use gr = tables::grapheme;
+        use tables::grapheme as gr;
         if self.string.len() == 0 {
             return None;
         }
@@ -325,7 +325,7 @@ fn next(&mut self) -> Option<&'a str> {
 impl<'a> DoubleEndedIterator<&'a str> for Graphemes<'a> {
     #[inline]
     fn next_back(&mut self) -> Option<&'a str> {
-        use gr = tables::grapheme;
+        use tables::grapheme as gr;
         if self.string.len() == 0 {
             return None;
         }

src/test/compile-fail/resolve-conflict-import-vs-extern-crate.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std = std::slice; //~ ERROR import conflicts with imported crate
+use std::slice as std; //~ ERROR import conflicts with imported crate
 
 fn main() {
 }

src/test/run-pass/extern-mod-ordering-exe.rs

@@ -12,7 +12,7 @@
 
 extern crate extern_mod_ordering_lib;
 
-use the_lib = extern_mod_ordering_lib::extern_mod_ordering_lib;
+use extern_mod_ordering_lib::extern_mod_ordering_lib as the_lib;
 
 pub fn main() {
     the_lib::f();