--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp1z/regress2.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,17 @@
+// PR c++/67142
+// { dg-options -std=c++17 }
+
+namespace detail {
+template <int> int split_at;
+}
+struct A {
+  decltype(0) operator()();
+};
+template <typename> A make;
+struct Tuple;
+auto check =
+    [](auto, auto, auto) { [](auto... xs) { [=] { make<Tuple>(xs...); }; }(); };
+int main() {
+  namespace vd = detail;
+  check(vd::split_at<0>, make<Tuple>, make<Tuple>);
+}