parser.c (cp_parser_type_id_1): 'auto' type is ok with a late-specified return type.

	* parser.c (cp_parser_type_id_1): 'auto' type is ok with a
	late-specified return type.

From-SVN: r148306

gcc/cp/ChangeLog

+2009-06-08  Jason Merrill  <jason@redhat.com>
+
+	* parser.c (cp_parser_type_id_1): 'auto' type is ok with a
+	late-specified return type.
+
 2009-06-08  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/40373

gcc/cp/parser.c

@@ -13848,8 +13848,17 @@ cp_parser_type_id_1 (cp_parser* parser, bool is_template_arg)
   if (type_specifier_seq.type
       && type_uses_auto (type_specifier_seq.type))
     {
-      error ("invalid use of %<auto%>");
-      return error_mark_node;
+      /* A type-id with type 'auto' is only ok if the abstract declarator
+	 is a function declarator with a late-specified return type.  */
+      if (abstract_declarator
+	  && abstract_declarator->kind == cdk_function
+	  && abstract_declarator->u.function.late_return_type)
+	/* OK */;
+      else
+	{
+	  error ("invalid use of %<auto%>");
+	  return error_mark_node;
+	}
     }
   
   return groktypename (&type_specifier_seq, abstract_declarator,

gcc/testsuite/ChangeLog

+2009-06-08  Jason Merrill  <jason@redhat.com>
+
+	* g++.dg/cpp0x/auto15.C: New.
+
 2009-06-08  Jan Hubicka  <jh@suse.cz>
 
 	PR debug/39834

gcc/testsuite/g++.dg/cpp0x/auto15.C

+// { dg-options "-std=c++0x" }
+
+template< typename Fn > struct function;
+
+template< typename Result, typename ... ArgTypes >
+struct function< auto (ArgTypes...)->Result > {
+};
+
+int main()
+{
+   function< auto(double)->int > y;
+   return 0;
+}