re PR c++/46124 ([C++0x] ICE: tree check: expected var_decl or function_decl, have error_mark in cp_parser_lambda_declarator_opt, at cp/parser.c:7817 on invalid lambda function)

	PR c++/46124
	* parser.c (cp_parser_lambda_expression): Improve error recovery.
	(cp_parser_lambda_declarator_opt): Likewise.  Return bool.

From-SVN: r174386