[clang] [Clang][P1061] Add stuctured binding packs (PR #121417)

[via cfe-commits]

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@@ -1523,9 +1570,25 @@ void Sema::CheckCompleteDecompositionDeclaration(DecompositionDecl *DD) {
   // If the type of the decomposition is dependent, then so is the type of
   // each binding.
   if (DecompType->isDependentType()) {
-    for (auto *B : DD->bindings())
-      B->setType(Context.DependentTy);
+    for (auto *B : DD->bindings()) {
+      // Do not overwrite any pack type.
+      if (B->getType().isNull())
+        B->setType(Context.DependentTy);
+    }
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cor3ntin wrote:

I really would like to understand when this happen. Maybe a longer comment is in order?

https://github.com/llvm/llvm-project/pull/121417