30 lines
1.3 KiB
Plaintext
30 lines
1.3 KiB
Plaintext
error[E0277]: the trait bound `for<'a> <_ as Yokeable<'a>>::Output: IsCovariant<'a>` is not satisfied
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--> $DIR/issue-90950.rs:50:12
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LL | upcast(y)
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| ------ ^ the trait `for<'a> IsCovariant<'a>` is not implemented for `<_ as Yokeable<'a>>::Output`
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| |
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| required by a bound introduced by this call
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= help: the trait `IsCovariant<'a>` is implemented for `std::borrow::Cow<'a, T>`
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note: this is a known limitation of the trait solver that will be lifted in the future
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--> $DIR/issue-90950.rs:50:12
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LL | upcast(y)
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| -------^-
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| | |
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| | the trait solver is unable to infer the generic types that should be inferred from this argument
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| add turbofish arguments to this call to specify the types manually, even if it's redundant
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note: required by a bound in `upcast`
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--> $DIR/issue-90950.rs:27:42
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LL | fn upcast<Y>(x: Yoke<Y>) -> Yoke<Box<dyn IsCovariant<'static> + 'static>> where
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| ------ required by a bound in this function
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LL | Y: for<'a> Yokeable<'a>,
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LL | for<'a> <Y as Yokeable<'a>>::Output: IsCovariant<'a>
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| ^^^^^^^^^^^^^^^ required by this bound in `upcast`
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0277`.
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