I've been wondering if a derive-like procmacro annotation on traits to automatically generate these for Box/Arc/etc is possible. Would make the boilerplate consistent.
I really wish that clippy had a lint to tell you when you could add `+ ?Sized` to a bound and didn't (I doubt such a lint is actually possible). I've had so many instances where a library has issues because they wrote `impl<T: SomeTrait> SomeTrait for Box<T>`
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These days it is! Have you seen https://docs.rs/auto_impl/0.3.0/auto_impl/ …?
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No, proc_macro cannot see types. But I believe it should be possible to know whether the Size bound is necessary (namely when the value is moved out of).
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TBH I feel it's just poor defaults on Rust side. If it defaulted to arbitrary T (as it intuitively should), then you would add `: Sized` only where necessary for code to compile.
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