[libcxx-commits] [libcxx] [libc++] fix incorrect definition of __indirectly_binary_right_foldable (PR #219957)

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c8ef wrote:

Really cannot remember why I didn't directly use the `__indirectly_binary_left_foldable` but the `_detail`. Sorry for the bug again.

https://github.com/llvm/llvm-project/pull/219957