Incoming breakage: Remove unnecessary ?Sized bounds
#14
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Hello there 👋
?Sizedbounds in associated type bounds don't have any effect.Deref<Target: ?Sized>can simply be replaced withDerefwithout any change in semantics.If you look at the definition of trait
Deref, you can seetype Target: ?Sizedwhich states that<T as Deref>::Targetis not necessarilySizedby default for all typesT. Therefore a bound likeC: Derefimplies thatTargetis maybe-Sized. EvenC: Deref<Target: >(sic!) doesn't meanC: Deref<Target: Sized>just aswhere <C as Deref>::Target:(sic!) doesn't meanwhere <C as Deref>::Target: Sized.It's a bug in the current version of the Rust compiler that writing
Trait<Assoc: ?Sized>is allowed, it should've been forbidden all along. See also rust-lang/rust#135229.The compiler bug will likely be fixed soon. To avoid your crate from breaking in the future, I've removed the offending bounds.