PR c++/28261
	* parser.c (cp_lexer_next_token_is_decl_specifier_keyword): New
	function.
	(cp_parser_constructor_declarator_p): Use it.
	(cp_parser_check_type_definition): Return a value indicating
	whether or not the definition is valid.
	(cp_parser_enum_specifier): Skip invalid enum definitions.
	PR c++/28261
	* g++.dg/parse/enum3.C: New test.

From-SVN: r117835