re PR c++/85194 (ICE with structured binding in broken for-loop)

	PR c++/85194
	* parser.c (cp_parser_simple_declaration): For structured bindings,
	if *maybe_range_for_decl is NULL after parsing it, set it to
	error_mark_node.

	* g++.dg/cpp1z/decomp43.C: New test.

From-SVN: r259252

gcc/cp/ChangeLog

+2018-04-09  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/85194
+	* parser.c (cp_parser_simple_declaration): For structured bindings,
+	if *maybe_range_for_decl is NULL after parsing it, set it to
+	error_mark_node.
+
 2018-04-09  Jason Merrill  <jason@redhat.com>
 
 	PR c++/85256 - ICE capturing pointer to VLA.

gcc/cp/parser.c

@@ -12983,8 +12983,14 @@ cp_parser_simple_declaration (cp_parser* parser,
 	/* The next token should be either a `,' or a `;'.  */
 	cp_token *token = cp_lexer_peek_token (parser->lexer);
 	/* If it's a `;', we are done.  */
-	if (token->type == CPP_SEMICOLON || maybe_range_for_decl)
+	if (token->type == CPP_SEMICOLON)
 	  goto finish;
+	else if (maybe_range_for_decl)
+	  {
+	    if (*maybe_range_for_decl == NULL_TREE)
+	      *maybe_range_for_decl = error_mark_node;
+	    goto finish;
+	  }
 	/* Anything else is an error.  */
 	else
 	  {

gcc/testsuite/ChangeLog

 2018-04-09  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/85194
+	* g++.dg/cpp1z/decomp43.C: New test.
+
 	PR rtl-optimization/80463
 	* g++.dg/pr80463.C: Add -w to dg-options.
 

gcc/testsuite/g++.dg/cpp1z/decomp43.C

+// PR c++/85194
+// { dg-do compile { target c++11 } }
+// { dg-options "" }
+
+struct A { int i; };
+
+A x[2];
+
+void
+foo ()
+{
+  for (auto [i] = A () : x)	// { dg-error "initializer in range-based 'for' loop" }
+    ;				// { dg-warning "structured bindings only available with" "" { target c++14_down } .-1 }
+}