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37b956787a
Remove unused lifetime parameter from spawn_unchecked Amanieu caught this when reviewing the stabilization proposal in https://github.com/rust-lang/rust/issues/55132. The `'a` lifetime here is useless. The signature is asking the caller of `spawn_unchecked` to "give me any lifetime that is shorter than your F's and T's lifetime", which they can always to with no effect, because arbitrarily short lifetimes exist.