rustc: "as Trait" can now be written "as @Trait".

There is also code for ~Trait and &Trait, but these are currently (incorrectly)
synonyms for "as @Trait" and "as &Trait".

src/libsyntax/parse/common.rs

@@ -19,7 +19,7 @@ fn seq_sep_none() -> seq_sep {
 }
 
 fn token_to_str(reader: reader, ++token: token::token) -> ~str {
-    token::to_str(*reader.interner(), token)
+    token::to_str(reader.interner(), token)
 }
 
 trait parser_common {