Adding test case that I have to fix still

Author: brevzin

clang/test/CXX/special/class.dtor/p7.cpp

@@ -0,0 +1,48 @@
+// RUN: %clang_cc1 -verify -std=c++26 %s -Wno-defaulted-function-deleted -triple x86_64-linux-gnu
+
+struct NonTrivial {
+    NonTrivial(int) { }
+    ~NonTrivial() { }
+};
+
+union U0 {
+    NonTrivial nt;
+    int i;
+  };
+  U0 u0;
+
+// overload resolution to select a constructor to default-initialize an object of type X either fails
+union U1 {
+    U1(int);
+    NonTrivial nt;
+};
+U1 u1(1); // expected-error {{deleted destructor}}
+
+// or selects a constructor that is either deleted or not trivial, or
+union U2 {
+    U2() : nt(2) { }
+    NonTrivial nt;
+};
+U2 u2; // expected-error {{deleted destructor}}
+
+union U3 {
+    U3() = delete;
+    U3(int);
+    NonTrivial nt;
+};
+U3 u3(1); // expected-error {{deleted destructor}}
+
+// or X has a variant member V of class type M (or possibly multi-dimensional array thereof) where V has a default member initializer and M has a destructor that is non-trivial,
+union U4 {
+    NonTrivial nt = 1;
+};
+U4 u4; // expected-error {{deleted destructor}}
+
+union U5 {
+  NonTrivial nt;
+  U5* next = nullptr;
+};
+U5 u5;
+
+
+