C++ PATCH for c++/86060, c++98 ICE with range for

[Jason Merrill]

If we're going to allow it with a pedwarn, we shouldn't clobber the
decl with an error_mark_node.

Tested x86_64-pc-linux-gnu, applying to trunk and 8.

commit ee298d715781a806980f93348ba1b0afd62187db
Author: Jason Merrill <ja...@redhat.com>
Date:   Wed Jun 6 17:21:42 2018 +0200

            PR c++/86060 - ICE on range for with -std=c++98.
    
            * parser.c (cp_parser_init_statement): Don't clobber *decl after
            pedwarn.

diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 03aea2f1150..edb0ef8025e 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -12384,12 +12384,9 @@ cp_parser_init_statement (cp_parser *parser, tree *decl)
 	  cp_lexer_consume_token (parser->lexer);
 	  is_range_for = true;
 	  if (cxx_dialect < cxx11)
-	    {
-	      pedwarn (cp_lexer_peek_token (parser->lexer)->location, 0,
-		       "range-based %<for%> loops only available with "
-		       "-std=c++11 or -std=gnu++11");
-	      *decl = error_mark_node;
-	    }
+	    pedwarn (cp_lexer_peek_token (parser->lexer)->location, 0,
+		     "range-based %<for%> loops only available with "
+		     "-std=c++11 or -std=gnu++11");
 	}
       else
 	/* The ';' is not consumed yet because we told
diff --git a/gcc/testsuite/g++.dg/cpp0x/range-for35.C b/gcc/testsuite/g++.dg/cpp0x/range-for35.C
new file mode 100644
index 00000000000..c77a5af5a44
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/range-for35.C
@@ -0,0 +1,8 @@
+// PR c++/86060
+// { dg-options -Wpedantic }
+
+template <typename T> void foo(T (&a)[8]) {
+  for (int i : a)		// { dg-warning "range-based" "" { target c++98_only } }
+    i;
+}
+void fn1() { foo<int>; }