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When a trait is not implemented for a type, but there *is* an `impl` for another type or different trait params, we format the output to use highlighting in the same way that E0308 does for types. The logic accounts for 3 cases: - When both the type and trait in the expected predicate and the candidate are different - When only the types are different - When only the trait generic params are different For each case, we use slightly different formatting and wording.
67 lines
2.4 KiB
Plaintext
67 lines
2.4 KiB
Plaintext
error[E0277]: the trait bound `String: Copy` is not satisfied
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--> $DIR/unsatisfied-bounds.rs:30:18
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LL | let () = C::<String>;
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| ^^^^^^ the trait `Copy` is not implemented for `String`
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note: required by a bound in `C`
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--> $DIR/unsatisfied-bounds.rs:8:12
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LL | const C<T: Copy>: () = ();
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| ^^^^ required by this bound in `C`
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error[E0277]: the trait bound `Infallible: From<()>` is not satisfied
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--> $DIR/unsatisfied-bounds.rs:31:18
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LL | let () = K::<()>;
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| ^^ the trait `From<()>` is not implemented for `Infallible`
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= help: the trait `From<()>` is not implemented for `Infallible`
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but trait `From<!>` is implemented for it
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= help: for that trait implementation, expected `!`, found `()`
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note: required by a bound in `K`
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--> $DIR/unsatisfied-bounds.rs:12:17
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LL | const K<T>: () = ()
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| - required by a bound in this constant
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LL | where
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LL | Infallible: From<T>;
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| ^^^^^^^ required by this bound in `K`
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error[E0277]: the trait bound `Vec<u8>: Copy` is not satisfied
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--> $DIR/unsatisfied-bounds.rs:32:26
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LL | let _ = <() as Trait<Vec<u8>>>::A;
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| ^^^^^^^ the trait `Copy` is not implemented for `Vec<u8>`
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note: required by a bound in `Trait::A`
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--> $DIR/unsatisfied-bounds.rs:17:12
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LL | const A: u32
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| - required by a bound in this associated constant
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LL | where
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LL | P: Copy;
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| ^^^^ required by this bound in `Trait::A`
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error[E0277]: the trait bound `Infallible: From<()>` is not satisfied
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--> $DIR/unsatisfied-bounds.rs:33:46
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LL | let _ = <() as Trait<&'static str>>::B::<()>;
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| ^^ the trait `From<()>` is not implemented for `Infallible`
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= help: the trait `From<()>` is not implemented for `Infallible`
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but trait `From<!>` is implemented for it
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= help: for that trait implementation, expected `!`, found `()`
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note: required by a bound in `Trait::B`
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--> $DIR/unsatisfied-bounds.rs:21:21
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LL | const B<T>: u32
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| - required by a bound in this associated constant
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LL | where
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LL | Infallible: From<T>;
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| ^^^^^^^ required by this bound in `Trait::B`
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error: aborting due to 4 previous errors
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For more information about this error, try `rustc --explain E0277`.
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