The comment calls if `any_invocable`, but the standard ultimately chose [`move_only_function`](https://en.cppreference.com/w/cpp/utility/functional/move_only_function/move_only_function). And `absl::AnyInvocable` does not officially track the standard. PiperOrigin-RevId: 631612663 Change-Id: I3f21f33cd6e2c6ce06ac92a8d2a68db6f942ea1b
