decl.c (struct binding_level): New field using_directives.
* decl.c (struct binding_level): New field using_directives.
(push_using_decl): Not sorry anymore.
(push_using_directive): New function.
(lookup_tag): Use CP_DECL_CONTEXT to iterate.
(unqualified_namespace_lookup): New function, code from ...
(lookup_name_real): ... here.
* decl2.c (lookup_using_namespace): Pass using list instead of
initial scope.
(validate_nonmember_using_decl): New function.
(do_nonmember_using_decl): New function.
(do_toplevel_using_decl): Use them.
(do_local_using_decl): New function.
(do_using_directive): Support block-level directives.
* parse.y (simple_stmt): Support using declarations and
directives.
(namespace_qualifier, namespace_using_decl): New non-terminals.