[libcxx-commits] [libcxx] [libc++] Make sure `flat_set::key_compare` handle `boolean-testable` correctly (PR #132622)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne commented:

Thanks for the patch! Can you please add a test for this?

https://github.com/llvm/llvm-project/pull/132622