libcore: Fix Sized bounds on overloaded function traits.
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- Remove the `for Sized?` bound on `core::ops::FnOnce`, as it takes `self` by value and can never be implemented by an unsized type. - Add a missing `Sized?` bound to the blanket `core::ops::FnMut` impl, as both `Fn` and `FnMut` are `for Sized?`.
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Frankly, I'm not sure how useful it is for |
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In #19467, types implementing these traits are passed by value. For example: fn filter<P>(self, predicate: P) -> Filter<A, Self, P> where P: FnMut(&A)So unsized types that implement the traits won't be usable there. |
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- Remove the `for Sized?` bound on `core::ops::FnOnce`, as it takes `self` by value and can never be implemented by an unsized type. - Add a missing `Sized?` bound to the blanket `core::ops::FnMut` impl, as both `Fn` and `FnMut` are `for Sized?`.
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for Sized?bound oncore::ops::FnOnce, as it takesselfby value and can never be implemented by an unsized type.Sized?bound to the blanketcore::ops::FnMutimpl, as bothFnandFnMutarefor Sized?.