d93f7f93c4
For example:
enum Ty {
Unit,
List(Box<Ty>),
}
fn foo(x: Ty) -> Ty {
match x {
Ty::Unit => Ty::Unit,
Ty::List(elem) => foo(elem),
}
}
Before, the only suggestion was to rewrap `elem` with `Ty::List`,
which is unhelpful and confusing:
error[E0308]: mismatched types
--> src/test/ui/suggestions/boxed-variant-field.rs:9:31
|
9 | Ty::List(elem) => foo(elem),
| ^^^^
| |
| expected enum `Ty`, found struct `Box`
| help: try using a variant of the expected enum: `Ty::List(elem)`
|
= note: expected enum `Ty`
found struct `Box<Ty>`
Now, rustc will first suggest dereferencing the `Box`, which is most
likely what the user intended:
error[E0308]: mismatched types
--> src/test/ui/suggestions/boxed-variant-field.rs:9:31
|
9 | Ty::List(elem) => foo(elem),
| ^^^^ expected enum `Ty`, found struct `Box`
|
= note: expected enum `Ty`
found struct `Box<Ty>`
help: try dereferencing the `Box`
|
9 | Ty::List(elem) => foo(*elem),
| +
help: try using a variant of the expected enum
|
9 | Ty::List(elem) => foo(Ty::List(elem)),
| ~~~~~~~~~~~~~~
17 lines
417 B
Plaintext
17 lines
417 B
Plaintext
error[E0308]: mismatched types
|
|
--> $DIR/terr-sorts.rs:10:14
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|
|
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LL | want_foo(b);
|
|
| ^ expected struct `Foo`, found struct `Box`
|
|
|
|
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= note: expected struct `Foo`
|
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found struct `Box<Foo>`
|
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help: try dereferencing the `Box`
|
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LL | want_foo(*b);
|
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| +
|
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0308`.
|