[clang] [clang-tools-extra] [Clang] [Sema] Diagnose unknown std::initializer_list layout in SemaInit (PR #95580)

[via cfe-commits]

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@@ -9392,6 +9392,57 @@ ExprResult InitializationSequence::Perform(Sema &S,
       // Wrap it in a construction of a std::initializer_list<T>.
       CurInit = new (S.Context) CXXStdInitializerListExpr(Step->Type, MTE);
 
+      if (!Step->Type->isDependentType()) {
+        assert(S.isCompleteType(CurInit.get()->getExprLoc(), Step->Type,
+                                Sema::CompleteTypeKind::Normal) &&
+               "std::initializer_list<E> incomplete when used during "
+               "initialization");
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Sirraide wrote:

Not too familiar with SemaInit, but I’m assuming this condition is already diagnosed elsewhere?

https://github.com/llvm/llvm-project/pull/95580