PR c++/70781 - ICE on ill-formed lambda.

	* parser.c (cp_parser_lambda_expression): Unset OK if there was an
	error parsing the lambda-declarator.

From-SVN: r238563

gcc/cp/ChangeLog

 2016-07-21  Jason Merrill  <jason@redhat.com>
 
+	PR c++/70781
+	* parser.c (cp_parser_lambda_expression): Unset OK if there was an
+	error parsing the lambda-declarator.
+
 	PR c++/71896
 	* constexpr.c (cxx_eval_binary_expression): Handle comparison
 	between lowered and unlowered PTRMEM_CST.

gcc/cp/parser.c

@@ -9771,10 +9771,12 @@ cp_parser_lambda_expression (cp_parser* parser)
 
     ok &= cp_parser_lambda_declarator_opt (parser, lambda_expr);
 
+    if (ok && cp_parser_error_occurred (parser))
+      ok = false;
+
     if (ok)
       {
-	if (!cp_parser_error_occurred (parser)
-	    && cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE)
+	if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE)
 	    && cp_parser_start_tentative_firewall (parser))
 	  start = token;
 	cp_parser_lambda_body (parser, lambda_expr);

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-ice16.C

+// PR c++/70781
+// { dg-do compile { target c++11 } }
+
+template < typename T >  
+void foo ()
+{
+  T ([=] (S) { [=] {}; }); 	// { dg-error "" }
+}