[clang] [clang-tools-extra] [Clang] Add a builtin that deduplicate types into a pack (PR #106730)

[Ilya Biryukov via cfe-commits]

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@@ -935,15 +938,18 @@ class PackDeductionScope {
       S.collectUnexpandedParameterPacks(Pattern, Unexpanded);
       for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) {
         unsigned Depth, Index;
-        std::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]);
+        if (auto DI = getDepthAndIndex(Unexpanded[I])) {
+          std::tie(Depth, Index) = *DI;
+        } else {
+          continue;
+        }
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ilya-biryukov wrote:

Done.

https://github.com/llvm/llvm-project/pull/106730