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use std::ops::Add; | ||
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trait Trait<T> { | ||
fn get(self) -> T; | ||
} | ||
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struct Holder<T>(T); | ||
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impl<T> Trait<T> for Holder<T> { | ||
fn get(self) -> T { | ||
self.0 | ||
} | ||
} | ||
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enum Either<L, R> { | ||
Left(L), | ||
Right(R), | ||
} | ||
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impl<L, R> Either<L, R> { | ||
fn converge<T>(self) -> T where L: Trait<T>, R: Trait<T> { | ||
match self { | ||
Either::Left(val) => val.get(), | ||
Either::Right(val) => val.get(), | ||
} | ||
} | ||
} | ||
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fn add_generic<A: Add<B>, B>(lhs: A, rhs: B) -> Either< | ||
impl Trait<<A as Add<B>>::Output>, | ||
impl Trait<<A as Add<B>>::Output> | ||
> { | ||
if true { | ||
Either::Left(Holder(lhs + rhs)) | ||
} else { | ||
Either::Right(Holder(lhs + rhs)) | ||
} | ||
} | ||
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fn add_one( | ||
value: u32, | ||
) -> Either<impl Trait<<u32 as Add<u32>>::Output>, impl Trait<<u32 as Add<u32>>::Output>> { | ||
//~^ ERROR: the trait bound `impl Trait<<u32 as std::ops::Add>::Output>: Trait<u32>` | ||
//~| ERROR: the trait bound `impl Trait<<u32 as std::ops::Add>::Output>: Trait<u32>` | ||
add_generic(value, 1u32) | ||
} | ||
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pub fn main() { | ||
add_one(3).converge(); | ||
} |
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error[E0277]: the trait bound `impl Trait<<u32 as std::ops::Add>::Output>: Trait<u32>` is not satisfied | ||
--> $DIR/issue-58344.rs:42:13 | ||
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LL | ) -> Either<impl Trait<<u32 as Add<u32>>::Output>, impl Trait<<u32 as Add<u32>>::Output>> { | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Trait<u32>` is not implemented for `impl Trait<<u32 as std::ops::Add>::Output>` | ||
| | ||
= note: the return type of a function must have a statically known size | ||
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error[E0277]: the trait bound `impl Trait<<u32 as std::ops::Add>::Output>: Trait<u32>` is not satisfied | ||
--> $DIR/issue-58344.rs:42:52 | ||
| | ||
LL | ) -> Either<impl Trait<<u32 as Add<u32>>::Output>, impl Trait<<u32 as Add<u32>>::Output>> { | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Trait<u32>` is not implemented for `impl Trait<<u32 as std::ops::Add>::Output>` | ||
| | ||
= note: the return type of a function must have a statically known size | ||
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error: aborting due to 2 previous errors | ||
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For more information about this error, try `rustc --explain E0277`. |