[libcxx-commits] [libcxx] [NFC][libc++] Adds (multi|)(map|set) forward declarations. (PR #131541)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne approved this pull request.

I really like this patch, thanks for cleaning this up!

LGTM assuming fixing the CI doesn't require much changes. It looks like you might be hitting another instance of https://github.com/llvm/llvm-project/issues/131814.

You could try re-exporting like this:

```
// under std.functional
module operations {
  header "__functional/operations.h"
  export std.fwd.functional
}
```

https://github.com/llvm/llvm-project/pull/131541