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 leaning toward rejection of this example by the compiler, but I'm not an
expert. Could you help confirm whether this code is invalid?
https://github.com/llvm/llvm-project/pull/124137
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