[libcxx-commits] [libcxx] [libc++] Fix ill-formed return in function_ref's static-call path (PR #228868)

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Kim-J-Smith wrote:

The mingw-dll failure is in `try_lock_for.pass.cpp:59`, an unrelated timing-sensitive test (comments say "technically flaky"). Re-running the failed job may resolve it.

https://github.com/llvm/llvm-project/pull/228868