* cp-tree.h (DECL_NAMESPACE_ASSOCIATIONS): New macro.
        * name-lookup.c (parse_using_directive): New fn.
        (is_associated_namespace): New fn.
        (arg_assoc_namespace): Also check associated namespaces.
        * name-lookup.h: Declare new fns.
        * pt.c (maybe_process_partial_specialization): Allow
        specialization in associated namespace.
        * parser.c (cp_parser_using_directive): Accept attributes.  Use
        parse_using_directive.

From-SVN: r73468