De-mode vec::each() and many of the str iteration routines

Note that the method foo.each() is not de-moded, nor the other
vec routines.

src/libsyntax/ast_map.rs

@@ -293,8 +293,10 @@ fn map_struct_def(struct_def: @ast::struct_def, parent_node: ast_node,
     }
     let d_id = ast_util::local_def(id);
     let p = extend(cx, ident);
-     // only need to handle methods
-    do vec::iter(struct_def.methods) |m| { map_method(d_id, p, m, cx); }
+    // only need to handle methods
+    for vec::each(struct_def.methods) |m| {
+        map_method(d_id, p, *m, cx);
+    }
 }
 
 fn map_view_item(vi: @view_item, cx: ctx, _v: vt) {