syntax: Clean out obsolete syntax parsing

All of these features have been obsolete since February 2014, where most have
been obsolete since 2013. There shouldn't be any more need to keep around the
parser hacks after this length of time.

src/test/bench/noise.rs

@@ -52,7 +52,7 @@ impl Noise2DContext {
         for (i, x) in permutations.mut_iter().enumerate() {
             *x = i as i32;
         }
-        rng.shuffle_mut(permutations);
+        rng.shuffle(permutations);
 
         Noise2DContext { rgradients: rgradients, permutations: permutations }
     }

src/test/compile-fail/loop-as-continue.rs

@@ -1,15 +0,0 @@
-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-fn main() {
-    loop {
-        loop //~ ERROR: `loop` instead of `continue`
-    }
-}

src/test/compile-fail/obsolete-syntax.rs

@@ -1,16 +0,0 @@
-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-trait A {
-    pub fn foo(); //~ ERROR: visibility not necessary
-    pub fn bar(); //~ ERROR: visibility not necessary
-}
-
-fn main() { }

src/test/compile-fail/useless-priv2.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 pub trait E {
-    pub fn foo();               //~ ERROR: obsolete syntax
+    pub fn foo();               //~ ERROR: unnecessary visibility
 }
-trait F { pub fn foo(); }       //~ ERROR: obsolete syntax
+trait F { pub fn foo(); }       //~ ERROR: unnecessary visibility
+
+fn main() {}