Core DR 904 PR c++/41933

Core DR 904 PR c++/41933

	Core DR 904
	PR c++/41933
	* parser.c (cp_parser_lambda_introducer): Handle variadic capture.
	* lambda.c (add_capture): Handle variadic capture.
	(add_default_capture, lambda_capture_field_type): Likewise.
	(build_capture_proxy, register_capture_members): Likewise.
	* pt.c (register_specialization): Allow FIELD_DECL.
	(retrieve_specialization): Likewise.
	(find_parameter_packs_r): Handle FIELD_DECL and VAR_DECL.
	(tsubst_pack_expansion): Handle FIELD_DECL packs.
	(gen_elem_of_pack_expansion_instantiation): Likewise.
	(instantiate_class_template_1): Likewise.
	(tsubst_decl, tsubst_copy): Likewise.
	(tsubst_expr) [DECL_EXPR]: Handle capture proxy packs.
	(tsubst_copy_and_build) [VAR_DECL]: Likewise.
	* semantics.c (finish_non_static_data_member): Don't try to represent
	the type of a COMPOUND_REF of a FIELD_DECL pack.

From-SVN: r202605