--- a/gcc/testsuite/g++.dg/cpp1z/constexpr-lambda6.C	Fri Oct 27 22:46:09 2017 +0900
+++ b/gcc/testsuite/g++.dg/cpp1z/constexpr-lambda6.C	Thu Oct 25 07:37:49 2018 +0900
@@ -1,5 +1,5 @@
 // Testcase from P0170R1
-// { dg-options -std=c++17 }
+// { dg-do compile { target c++17 } }
 
 auto monoid = [](auto v) { return [=] { return v; }; };
 auto add = [](auto m1) constexpr {
@@ -24,6 +24,6 @@
   // expression.
   auto two = monoid(2);
   if (!(two() == 2)) __builtin_abort(); // OK, not a constant expression.
-  static_assert(add(one)(one)() == two()); // { dg-error "" } two() is not a constant expression
+  static_assert(add(one)(one)() == two()); // { dg-error "|in .constexpr. expansion of " } two() is not a constant expression
   static_assert(add(one)(one)() == monoid(2)()); // OK
 }