[clang] [Sema] Instantiate destructors for initialized anonymous union fields (PR #128866)

[Eli Friedman via cfe-commits]

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@@ -51,18 +51,18 @@ namespace disabled_dtor {
   union disable_dtor {
     T val;
     template<typename...U>
-    disable_dtor(U &&...u) : val(forward<U>(u)...) {}
+    disable_dtor(U &&...u) : val(forward<U>(u)...) {} // expected-error {{attempt to use a deleted function}}
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efriedma-quic wrote:

I think this error is correct: if the body of the constructor throws, we call the destructor for val.

https://github.com/llvm/llvm-project/pull/128866