9b45cfdbdd
This change tweaks the error message generation to actually use the
`#[do_not_recommend]` attribute if present by just skipping the marked
trait impl in favour of the parent impl. It also adds a compile test for
this behaviour. Without this change the test would output the following
error:
```
error[E0277]: the trait bound `&str: Expression` is not satisfied
--> /home/weiznich/Documents/rust/rust/tests/ui/diagnostic_namespace/do_not_recommend.rs:53:15
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LL | SelectInt.check("bar");
| ^^^^^ the trait `Expression` is not implemented for `&str`, which is required by `&str: AsExpression<Integer>`
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= help: the following other types implement trait `Expression`:
Bound<T>
SelectInt
note: required for `&str` to implement `AsExpression<Integer>`
--> /home/weiznich/Documents/rust/rust/tests/ui/diagnostic_namespace/do_not_recommend.rs:26:13
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LL | impl<T, ST> AsExpression<ST> for T
| ^^^^^^^^^^^^^^^^ ^
LL | where
LL | T: Expression<SqlType = ST>,
| ------------------------ unsatisfied trait bound introduced here
```
Note how that mentions `&str: Expression` before and now mentions `&str:
AsExpression<Integer>` instead which is much more helpful for users.
Open points for further changes before stabilization:
* We likely want to move the attribute to the `#[diagnostic]` namespace
to relax the guarantees given?
* How does it interact with the new trait solver?
16 lines
479 B
Plaintext
16 lines
479 B
Plaintext
error[E0277]: the trait bound `(): Root` is not satisfied
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--> $DIR/stacked.rs:19:18
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LL | needs_root::<()>();
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| ^^ the trait `Root` is not implemented for `()`
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note: required by a bound in `needs_root`
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--> $DIR/stacked.rs:16:18
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LL | fn needs_root<T: Root>() {}
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| ^^^^ required by this bound in `needs_root`
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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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