extern crate foobar as foo;

Implements remaining part of RFC rust-lang#47.
Addresses issue rust-lang#16461.

Removed link_attrs from rust.md, they don't appear to be supported by
the parser.

Changed all the tests to use the new extern crate syntax

Change pretty printer to use 'as' syntax

src/doc/rust.md

@@ -891,9 +891,8 @@ There are several kinds of view item:
 ##### Extern crate declarations
 
 ~~~~ {.ebnf .gram}
-extern_crate_decl : "extern" "crate" ident [ '(' link_attrs ')' ] ? [ '=' string_lit ] ? ;
-link_attrs : link_attr [ ',' link_attrs ] + ;
-link_attr : ident '=' literal ;
+extern_crate_decl : "extern" "crate" crate_name
+crate_name: ident | ( string_lit as ident )
 ~~~~
 
 An _`extern crate` declaration_ specifies a dependency on an external crate.
@@ -913,11 +912,9 @@ Four examples of `extern crate` declarations:
 ~~~~ {.ignore}
 extern crate pcre;
 
-extern crate std; // equivalent to: extern crate std = "std";
+extern crate std; // equivalent to: extern crate std as std;
 
-extern crate ruststd = "std"; // linking to 'std' under another name
-
-extern crate foo = "some/where/rust-foo#foo:1.0"; // a full crate ID for external tools
+extern crate "std" as ruststd; // linking to 'std' under another name
 ~~~~
 
 ##### Use declarations

src/libsyntax/parse/parser.rs

@@ -4825,7 +4825,8 @@ impl<'a> Parser<'a> {
     /// # Example
     ///
     /// extern crate url;
-    /// extern crate foo = "bar";
+    /// extern crate foo = "bar"; //deprecated
+    /// extern crate "bar" as foo;
     fn parse_item_extern_crate(&mut self,
                                 lo: BytePos,
                                 visibility: Visibility,
@@ -4836,14 +4837,23 @@ impl<'a> Parser<'a> {
             token::IDENT(..) => {
                 let the_ident = self.parse_ident();
                 self.expect_one_of(&[], &[token::EQ, token::SEMI]);
+                // NOTE - #16689 change this to a warning once
+                //        the 'as' support is in stage0
                 let path = if self.token == token::EQ {
                     self.bump();
                     Some(self.parse_str())
                 } else {None};
 
                 self.expect(&token::SEMI);
                 (path, the_ident)
-            }
+            },
+            token::LIT_STR(..) | token::LIT_STR_RAW(..) => {
+                let path = self.parse_str();
+                self.expect_keyword(keywords::As);
+                let the_ident = self.parse_ident();
+                self.expect(&token::SEMI);
+                (Some(path), the_ident)
+            },
             _ => {
                 let span = self.span;
                 let token_str = self.this_token_to_string();

src/libsyntax/print/pprust.rs

@@ -2375,13 +2375,13 @@ impl<'a> State<'a> {
         match item.node {
             ast::ViewItemExternCrate(id, ref optional_path, _) => {
                 try!(self.head("extern crate"));
-                try!(self.print_ident(id));
                 for &(ref p, style) in optional_path.iter() {
+                    try!(self.print_string(p.get(), style));
                     try!(space(&mut self.s));
-                    try!(word(&mut self.s, "="));
+                    try!(word(&mut self.s, "as"));
                     try!(space(&mut self.s));
-                    try!(self.print_string(p.get(), style));
                 }
+                try!(self.print_ident(id));
             }
 
             ast::ViewItemUse(ref vp) => {

src/test/auxiliary/crateresolve4b-1.rs

@@ -13,6 +13,6 @@
 #![crate_id="crateresolve4b#0.1"]
 #![crate_type = "lib"]
 
-extern crate crateresolve4a = "crateresolve4a#0.2";
+extern crate "crateresolve4a#0.2" as crateresolve4a;
 
 pub fn f() -> int { crateresolve4a::g() }

src/test/auxiliary/crateresolve4b-2.rs

@@ -13,6 +13,6 @@
 #![crate_id="crateresolve4b#0.2"]
 #![crate_type = "lib"]
 
-extern crate crateresolve4a = "crateresolve4a#0.1";
+extern crate "crateresolve4a#0.1" as crateresolve4a;
 
 pub fn g() -> int { crateresolve4a::f() }

src/test/auxiliary/issue-12133-dylib2.rs

@@ -12,6 +12,6 @@
 
 #![crate_type = "dylib"]
 
-extern crate a = "issue-12133-rlib";
-extern crate b = "issue-12133-dylib";
+extern crate "issue-12133-rlib" as a;
+extern crate "issue-12133-dylib" as b;
 

src/test/auxiliary/issue-13560-3.rs

@@ -13,6 +13,6 @@
 #![crate_type = "rlib"]
 #![feature(phase)]
 
-#[phase(plugin)] extern crate t1 = "issue-13560-1";
-#[phase(plugin, link)] extern crate t2 = "issue-13560-2";
+#[phase(plugin)] extern crate "issue-13560-1" as t1;
+#[phase(plugin, link)] extern crate "issue-13560-2" as t2;
 

src/test/auxiliary/issue-13620-2.rs

@@ -8,6 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-extern crate crate1 = "issue-13620-1";
+extern crate "issue-13620-1" as crate1;
 
 pub static FOO2: crate1::Foo = crate1::FOO;

src/test/auxiliary/issue-13872-2.rs

@@ -8,6 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-extern crate foo = "issue-13872-1";
+extern crate "issue-13872-1" as foo;
 
 pub use foo::B;

src/test/auxiliary/issue-13872-3.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-extern crate bar = "issue-13872-2";
+extern crate "issue-13872-2" as bar;
 
 use bar::B;
 

src/test/auxiliary/syntax-extension-with-dll-deps-2.rs

@@ -14,7 +14,7 @@
 #![crate_type = "dylib"]
 #![feature(plugin_registrar, quote, globs)]
 
-extern crate other = "syntax-extension-with-dll-deps-1";
+extern crate "syntax-extension-with-dll-deps-1" as other;
 extern crate syntax;
 extern crate rustc;
 

src/test/auxiliary/trait_default_method_xc_aux_2.rs

@@ -10,7 +10,7 @@
 
 // aux-build:trait_default_method_xc_aux.rs
 
-extern crate aux = "trait_default_method_xc_aux";
+extern crate "trait_default_method_xc_aux" as aux;
 use aux::A;
 
 pub struct a_struct { pub x: int }

src/test/compile-fail/bad-crate-id.rs

@@ -8,6 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-extern crate foo = ""; //~ ERROR: crate name must not be empty
+extern crate "" as foo; //~ ERROR: crate name must not be empty
 
 fn main() {}

src/test/compile-fail/bad-crate-id2.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-extern crate bar = "#a"; //~ ERROR: invalid character `#` in crate name: `#a`
+extern crate "#a" as bar; //~ ERROR: invalid character `#` in crate name: `#a`
 
 fn main() {}
 

src/test/compile-fail/issue-11680.rs

@@ -10,7 +10,7 @@
 
 // aux-build:issue-11680.rs
 
-extern crate other = "issue-11680";
+extern crate "issue-11680" as other;
 
 fn main() {
     let _b = other::Bar(1);

src/test/compile-fail/issue-12612.rs

@@ -10,7 +10,7 @@
 
 // aux-build:issue-12612-1.rs
 
-extern crate foo = "issue-12612-1";
+extern crate "issue-12612-1" as foo;
 
 use foo::bar;
 

src/test/compile-fail/privacy-struct-variant.rs

@@ -12,7 +12,7 @@
 
 #![feature(struct_variant)]
 
-extern crate other = "privacy-struct-variant";
+extern crate "privacy-struct-variant" as other;
 
 mod a {
     pub enum Foo {

src/test/compile-fail/privacy5.rs

@@ -11,7 +11,7 @@
 // aux-build:privacy-tuple-struct.rs
 // ignore-fast
 
-extern crate other = "privacy-tuple-struct";
+extern crate "privacy-tuple-struct" as other;
 
 mod a {
     pub struct A(());

src/test/compile-fail/struct-field-privacy.rs

@@ -10,7 +10,7 @@
 
 // aux-build:struct-field-privacy.rs
 
-extern crate xc = "struct-field-privacy";
+extern crate "struct-field-privacy" as xc;
 
 struct A {
     a: int,

src/test/compile-fail/unreachable-variant.rs

@@ -10,7 +10,7 @@
 
 // aux-build:unreachable-variant.rs
 
-extern crate other = "unreachable-variant";
+extern crate "unreachable-variant" as other;
 
 fn main() {
     let _x = other::super_sekrit::baz; //~ ERROR is private

src/test/compile-fail/use-meta-mismatch.rs

@@ -10,6 +10,6 @@
 
 // error-pattern:can't find crate for `extra`
 
-extern crate extra = "fake-crate";
+extern crate "fake-crate" as extra;
 
 fn main() { }

src/test/compile-fail/weak-lang-item.rs

@@ -16,4 +16,4 @@
 #![no_std]
 
 extern crate core;
-extern crate other = "weak-lang-items";
+extern crate "weak-lang-items" as other;

src/test/pretty/issue-4264.pp

@@ -2,8 +2,8 @@
 #![no_std]
 #![feature(globs)]
 #[phase(plugin, link)]
-extern crate std = "std";
-extern crate rt = "native";
+extern crate "std" as std;
+extern crate "native" as rt;
 #[prelude_import]
 use std::prelude::*;
 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT

src/test/pretty/raw-str-nonexpr.rs

@@ -13,6 +13,6 @@
 #![feature(asm)]
 
 #[cfg = r#"just parse this"#]
-extern crate blah = r##"blah"##;
+extern crate r##"blah"## as blah;
 
 fn main() { unsafe { asm!(r###"blah"###); } }

src/test/run-pass-fulldeps/issue-13560.rs

@@ -16,7 +16,7 @@
 // Regression test for issue #13560, the test itself is all in the dependent
 // libraries. The fail which previously failed to compile is the one numbered 3.
 
-extern crate t2 = "issue-13560-2";
-extern crate t3 = "issue-13560-3";
+extern crate "issue-13560-2" as t2;
+extern crate "issue-13560-3" as t3;
 
 fn main() {}

src/test/run-pass-fulldeps/syntax-extension-with-dll-deps.rs

@@ -15,7 +15,7 @@
 #![feature(phase)]
 
 #[phase(plugin)]
-extern crate extension = "syntax-extension-with-dll-deps-2";
+extern crate "syntax-extension-with-dll-deps-2" as extension;
 
 fn main() {
     foo!();

src/test/run-pass/extern-foreign-crate.rs

@@ -8,6 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-extern crate mystd = "std";
+extern crate "std" as mystd;
 
 pub fn main() {}

src/test/run-pass/issue-10028.rs

@@ -10,7 +10,7 @@
 
 // aux-build:issue-10028.rs
 
-extern crate issue10028 = "issue-10028";
+extern crate "issue-10028" as issue10028;
 
 use issue10028::ZeroLengthThingWithDestructor;
 

src/test/run-pass/issue-11224.rs

@@ -10,6 +10,6 @@
 
 // aux-build:issue-11224.rs
 
-extern crate unused = "issue-11224";
+extern crate "issue-11224" as unused;
 
 pub fn main() {}

src/test/run-pass/issue-11225-1.rs

@@ -10,7 +10,7 @@
 
 // aux-build:issue-11225-1.rs
 
-extern crate foo = "issue-11225-1";
+extern crate "issue-11225-1" as foo;
 
 pub fn main() {
     foo::foo(1i);

src/test/run-pass/issue-11225-2.rs

@@ -10,7 +10,7 @@
 
 // aux-build:issue-11225-2.rs
 
-extern crate foo = "issue-11225-2";
+extern crate "issue-11225-2" as foo;
 
 pub fn main() {
     foo::foo(1i);

src/test/run-pass/issue-11508.rs

@@ -10,7 +10,7 @@
 
 // aux-build:issue-11508.rs
 
-extern crate rand = "issue-11508";
+extern crate "issue-11508" as rand;
 
 use rand::{Closed01, random};
 

src/test/run-pass/issue-11529.rs

@@ -10,7 +10,7 @@
 
 // aux-build:issue-11529.rs
 
-extern crate a = "issue-11529";
+extern crate "issue-11529" as a;
 
 fn main() {
     let one = 1;

src/test/run-pass/issue-12133-1.rs

@@ -11,7 +11,7 @@
 // aux-build:issue-12133-rlib.rs
 // aux-build:issue-12133-dylib.rs
 
-extern crate a = "issue-12133-rlib";
-extern crate b = "issue-12133-dylib";
+extern crate "issue-12133-rlib" as a;
+extern crate "issue-12133-dylib" as b;
 
 fn main() {}

src/test/run-pass/issue-12133-2.rs

@@ -12,7 +12,7 @@
 // aux-build:issue-12133-dylib.rs
 // no-prefer-dynamic
 
-extern crate a = "issue-12133-rlib";
-extern crate b = "issue-12133-dylib";
+extern crate "issue-12133-rlib" as a;
+extern crate "issue-12133-dylib" as b;
 
 fn main() {}

src/test/run-pass/issue-12133-3.rs

@@ -12,6 +12,6 @@
 // aux-build:issue-12133-dylib.rs
 // aux-build:issue-12133-dylib2.rs
 
-extern crate other = "issue-12133-dylib2";
+extern crate "issue-12133-dylib2" as other;
 
 fn main() {}

src/test/run-pass/issue-12612.rs

@@ -11,8 +11,8 @@
 // aux-build:issue-12612-1.rs
 // aux-build:issue-12612-2.rs
 
-extern crate foo = "issue-12612-1";
-extern crate bar = "issue-12612-2";
+extern crate "issue-12612-1" as foo;
+extern crate "issue-12612-2" as bar;
 
 mod test {
     use bar::baz;

src/test/run-pass/issue-13620.rs

@@ -11,7 +11,7 @@
 // aux-build:issue-13620-1.rs
 // aux-build:issue-13620-2.rs
 
-extern crate crate2 = "issue-13620-2";
+extern crate "issue-13620-2" as crate2;
 
 fn main() {
     (crate2::FOO2.foo)();

src/test/run-pass/issue-13872.rs

@@ -12,7 +12,7 @@
 // aux-build:issue-13872-2.rs
 // aux-build:issue-13872-3.rs
 
-extern crate other = "issue-13872-3";
+extern crate "issue-13872-3" as other;
 
 fn main() {
     other::foo();