fb31487fdb
Don't require method impls for methods with `Self:Sized` bounds for impls for unsized types Similarly to how #112319 doesn't require specifying associated types with `Self: Sized` bounds on `dyn Trait`, we now don't require assoc items with `Self: Sized` bounds to be in impls of for unsized types. Additionally we lint assoc items with `Self: Sized` bounds that are in such impls: ```rust trait Foo { fn foo() where Self: Sized; } impl Foo for () { fn foo() {} } impl Foo for i32 {} //~^ ERROR: not all trait items implemented, missing: `foo` impl Foo for dyn std::fmt::Debug {} #[deny(dead_code)] impl Foo for dyn std::fmt::Display { fn foo() {} //~^ ERROR this item cannot be used as its where bounds are not satisfied } ``` Note that this works with the same `Self: Sized` specific logic we already have for `dyn Trait`, so no new capabilities like avoiding assoc items with `Self: Copy` bounds on impls for `String` or such are added here. Specifying `where ConcreteType: Sized` in a trait and implementing the trait for `ConcreteType` also does not work, it *must* be exactly `Self: Sized`.
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