Don't crash on invalid call to append.

From-SVN: r168187

diff --git a/gcc/go/gofrontend/expressions.cc b/gcc/go/gofrontend/expressions.cc
index 491b71ab748cc42a02786e06bc9083a741798854..ea5821b56857f1404228083706e580bf3423a4c0 100644 (file)
--- a/gcc/go/gofrontend/expressions.cc
+++ b/gcc/go/gofrontend/expressions.cc
@@ -7387,8 +7387,11 @@ Builtin_call_expression::do_check_types(Gogo*)
            this->report_error(_("not enough arguments"));
            break;
          }
-       /* Lowering varargs should have left us with 2 arguments.  */
-       gcc_assert(args->size() == 2);
+       if (args->size() > 2)
+         {
+           this->report_error(_("too many arguments"));
+           break;
+         }
        std::string reason;
        if (!Type::are_assignable(args->front()->type(), args->back()->type(),
                                  &reason))