Ah yes, that's slightly better.
(I've kept the NULL check in strip_using_decl, it seems safer to me.
Just tell me if you prefer not)
Tested x86_64-unkown-linux-gnu. OK for trunk and 4.7 ?
2012-03-08 Fabien Chêne<fabien@gcc.gnu.org>
PR c++/52465
* decl.c (grokdeclarator): Call strip_using_decl.
* parser.c (cp_parser_class_name): Call strip_using_decl and
perform some checks on the target decl.
* name-lookup.c (strip_using_decl): Returns NULL_TREE if the decl
to be stripped is NULL_TREE.
(qualify_lookup): Call strip_using_decl and perform some checks on
the target decl.