syntax: Remove cdir_syntax. Unused

src/libsyntax/ast.rs

@@ -276,8 +276,6 @@ enum crate_directive_ {
     // exists only to preserve the view items in order in case we decide to
     // pretty-print crates in the future.
     cdir_view_item(@view_item),
-
-    cdir_syntax(@path),
 }
 
 type crate_directive = spanned<crate_directive_>;

src/libsyntax/fold.rs

@@ -170,7 +170,6 @@ fn noop_fold_crate_directive(cd: crate_directive_, fld: ast_fold) ->
                          /* FIXME (#2543) */ copy attrs)
           }
           cdir_view_item(vi) => cdir_view_item(fld.fold_view_item(vi)),
-          cdir_syntax(_) => copy cd
         }
 }
 

src/libsyntax/parse/eval.rs

@@ -124,7 +124,6 @@ fn eval_crate_directive(cx: ctx, cdir: @ast::crate_directive, prefix: &Path,
         items.push(i);
       }
       ast::cdir_view_item(vi) => view_items.push(vi),
-      ast::cdir_syntax(*) => ()
     }
 }
 //

src/libsyntax/visit.rs

@@ -100,7 +100,6 @@ fn visit_crate_directive<E>(cd: @crate_directive, e: E, v: vt<E>) {
         visit_crate_directive(*cdir, e, v);
       },
       cdir_view_item(vi) => v.visit_view_item(vi, e, v),
-      cdir_syntax(_) => ()
     }
 }