--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/debug/pr84813.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,33 @@
+// PR c++/84813
+// { dg-do compile }
+// { dg-options "-g -std=c++14" }
+
+template <typename>
+struct P {};
+
+template <int>
+struct F {
+  using type = int;
+};
+
+template <typename T>
+void
+apply ()
+{
+  constexpr int N = T::N;
+  [] (typename F<N>::type)
+  {
+    auto f = [] () {};
+    P<decltype (f)>{};
+  };
+}
+
+struct A {
+  static constexpr int N = 1;
+};
+
+void
+instantiate ()
+{
+  apply<A> ();
+}