* semantics.c (maybe_add_lambda_conv_op): New.
	* parser.c (cp_parser_lambda_expression): Call it.
	(cp_parser_lambda_declarator_opt): Make op() static if
	no captures.
	* mangle.c (write_closure_type_name): Adjust.
	* semantics.c (finish_this_expr): Adjust.
	* decl.c (grok_op_properties): Allow it.
	* call.c (build_user_type_conversion_1): Handle static conversion op.
	(build_op_call): And op().

From-SVN: r153617