* decl.c (start_decl): Always pedwarn about vacuously redeclaring
	a member.
	(start_function): Call check_default_args.
	* decl2.c (grokfield): Don't call check_default_args.
	(check_default_args): Use cp_error_at.
	* lex.c (do_pending_defargs): Call check_default_args.
	* call.c (build_scoped_method_call): Make sure get_type_value returns
	something before we try to use its TYPE_MAIN_VARIANT.

From-SVN: r20113