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491599569c
this commit makes `deref_into_dyn_supertrait` lint allow-by-default, removes future incompatibility (we finally live in a broken world), and changes the wording in the documentation. previously documentation erroneously said that it lints against *usage* of the deref impl, while it actually (since 104742) lints on the impl itself (oooops, my oversight, should have updated it 2+ years ago...)
22 lines
426 B
Rust
22 lines
426 B
Rust
//@ check-pass
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#![warn(deref_into_dyn_supertrait)]
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use std::ops::Deref;
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trait Bar<T> {}
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trait Foo: Bar<i32> {
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fn as_dyn_bar_u32<'a>(&self) -> &(dyn Bar<u32> + 'a);
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}
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impl<'a> Deref for dyn Foo + 'a {
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//~^ warn: this `Deref` implementation is covered by an implicit supertrait coercion
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type Target = dyn Bar<u32> + 'a;
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fn deref(&self) -> &Self::Target {
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self.as_dyn_bar_u32()
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}
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}
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fn main() {}
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