Refactored ast_map and friends, mainly to have Paths without storing them.

src/libsyntax/parse/obsolete.rs

@@ -175,8 +175,7 @@ impl ParserObsoleteMethods for Parser {
     fn is_obsolete_ident(&mut self, ident: &str) -> bool {
         match self.token {
             token::IDENT(sid, _) => {
-                let interned_string = token::get_ident(sid.name);
-                interned_string.equiv(&ident)
+                token::get_ident(sid).equiv(&ident)
             }
             _ => false
         }