--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp2a/constexpr-init13.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,37 @@
+// PR c++/91353 - P1331R2: Allow trivial default init in constexpr contexts.
+// { dg-do compile { target c++2a } }
+
+struct E { };
+
+struct S {
+  E e;
+  constexpr S() {}
+};
+
+constexpr S s;
+constexpr S s2[4];
+
+struct W {
+  [[no_unique_address]] E e1, e2;
+  constexpr W() {}
+};
+
+constexpr W w;
+constexpr W w2[4];
+
+struct Y {
+  [[no_unique_address]] E e;
+  __extension__ char a[0];
+  constexpr Y() {}
+};
+
+constexpr Y y;
+constexpr Y y2[4];
+
+struct Z {
+  [[no_unique_address]] E e;
+  int i;
+  constexpr Z(int n) :i(n) { }
+};
+
+constexpr Z z(42);