--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-nsdmi2.C	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,20 @@
+// PR c++/94205
+// { dg-do compile { target c++14 } }
+
+struct S
+{
+  struct A
+  {
+    S *p;
+    constexpr A(S* p): p(p) {}
+    constexpr operator int() { p->i = 5; return 6; }
+  };
+  int i;
+  int a = A(this);
+};
+
+
+constexpr S s = {};
+
+#define SA(X) static_assert((X),#X)
+SA(s.i == 5 && s.a == 6);