--- a/clang/test/Sema/invalid-member.cpp	Mon May 25 11:55:54 2020 +0900
+++ b/clang/test/Sema/invalid-member.cpp	Tue Jun 08 06:07:14 2021 +0900
@@ -13,3 +13,17 @@
 };
 // Should be able to evaluate sizeof without crashing.
 static_assert(sizeof(Y) == 1, "No valid members");
+
+class Z {
+  int array[sizeof(invalid())]; // expected-error {{use of undeclared identifier}}
+};
+// Should be able to evaluate sizeof without crashing.
+static_assert(sizeof(Z) == 1, "No valid members");
+
+constexpr int N = undef; // expected-error {{use of undeclared identifier}}
+template<int a>
+class ABC {};
+class T {
+  ABC<N> abc;
+};
+static_assert(sizeof(T) == 1, "No valid members");