ziqingluo-90 wrote:
> Hi @mizvekov
>
> I believe this change is impacting our downstream compiler. Here is a minimal
> example:
>
> ```
> #include <utility>
> #include <cstddef>
> namespace {
>
> template <typename INDEX_SEQUENCE>
> class ForEach; // intentionally undefined
>
>
>
> template <size_t... INDICES, template <typename, size_t...> class
> INDEX_CONTAINER>
> class ForEach<INDEX_CONTAINER<size_t, INDICES...>> {};
>
> } //namespace
>
>
>
> static void go()
> {
> ForEach<std::make_index_sequence<42>> X;
> }
> ```
>
> It was accepted by clang 19.1.0 and gcc but not the clang trunk:
> https://godbolt.org/z/hdYWq86Ke
>
> I'm not an expert, could you explain to me why
> `ForEach<std::make_index_sequence<42>>` does not specialize this template `
> class ForEach<INDEX_CONTAINER<size_t, INDICES...>> {};`?
@mizvekov, can you take a look at this?
https://github.com/llvm/llvm-project/pull/124137
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