re PR c++/65091 (decltype(~arg) fails for template functions)

	PR c++/65091
	* parser.c (cp_parser_unqualified_id): Don't accept ~x in a
	template if there is no type x in scope.

From-SVN: r225831

gcc/cp/ChangeLog

+2015-07-15  Jason Merrill  <jason@redhat.com>
+
+	PR c++/65091
+	* parser.c (cp_parser_unqualified_id): Don't accept ~x in a
+	template if there is no type x in scope.
+
 2015-07-14  Patrick Palka  <ppalka@gcc.gnu.org>
 
 	PR c++/66850

gcc/cp/parser.c

@@ -5162,8 +5162,15 @@ cp_parser_unqualified_id (cp_parser* parser,
 	    if (processing_template_decl
 		&& ! cp_parser_parse_definitely (parser))
 	      {
-		/* We couldn't find a type with this name, so just accept
-		   it and check for a match at instantiation time.  */
+		/* We couldn't find a type with this name.  If we're parsing
+		   tentatively, fail and try something else.  */
+		if (cp_parser_uncommitted_to_tentative_parse_p (parser))
+		  {
+		    cp_parser_simulate_error (parser);
+		    return error_mark_node;
+		  }
+		/* Otherwise, accept it and check for a match at instantiation
+		   time.  */
 		type_decl = cp_parser_identifier (parser);
 		if (type_decl != error_mark_node)
 		  type_decl = build_nt (BIT_NOT_EXPR, type_decl);

gcc/testsuite/g++.dg/parse/dtor17.C

+// PR c++/65091
+// { dg-do compile { target c++11 } }
+
+template<typename T>
+auto foo(T x) -> decltype(~x) {
+  return ~x;
+}
+
+int bar() {
+  return foo(10);
+}