--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-83856.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,30 @@
+// PR c++/83856
+// { dg-do compile { target c++14 } }
+
+namespace std {
+template <typename _Tp> _Tp declval();
+template <class _E> class initializer_list {
+  _E *_M_len;
+
+public:
+  __SIZE_TYPE__ size;
+  _E begin();
+};
+template <typename, unsigned> struct array { void operator[](long); };
+} // namespace std
+
+template <class> struct simd {
+  static int size();
+  template <class F> simd(F, decltype(std::declval<F>()(0)) * = nullptr) {}
+};
+template <class V, class... F>
+void test_tuples(std::initializer_list<std::array<float, 1>> data,
+                 F... fun_pack) {
+  auto it = data.begin();
+  const int remaining = V::size();
+  [](...) {}((fun_pack([&](auto) { it[remaining]; }), 0)...);
+}
+
+void f() {
+  test_tuples<simd<float>>({}, [](simd<float>) {});
+}