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rust/tests/ui/return/return-impl-trait-bad.stderr

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Suggest `impl Trait` return type Address #85991 Suggest the `impl Trait` return type syntax if the user tried to return a generic parameter and we get a type mismatch The suggestion is not emitted if the param appears in the function parameters, and only get the bounds that actually involve `T: ` directly It also checks whether the generic param is contained in any where bound (where it isn't the self type), and if one is found (like `Option<T>: Send`), it is not suggested. This also adds `TyS::contains`, which recursively vistits the type and looks if the other type is contained anywhere
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error[E0308]: mismatched types
--> $DIR/return-impl-trait-bad.rs:5:5
|
LL | fn bad_echo<T>(_t: T) -> T {
| - - expected `T` because of return type
| |
Tweak wording of type errors involving type params Fix #78206.
2023-10-18 17:10:48 -05:00
| expected this type parameter
Suggest `impl Trait` return type Address #85991 Suggest the `impl Trait` return type syntax if the user tried to return a generic parameter and we get a type mismatch The suggestion is not emitted if the param appears in the function parameters, and only get the bounds that actually involve `T: ` directly It also checks whether the generic param is contained in any where bound (where it isn't the self type), and if one is found (like `Option<T>: Send`), it is not suggested. This also adds `TyS::contains`, which recursively vistits the type and looks if the other type is contained anywhere
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LL | "this should not suggest impl Trait"
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected type parameter `T`, found `&str`
|
= note: expected type parameter `T`
found reference `&'static str`
Note that type param is chosen by caller when suggesting return impl Trait
2024-03-09 14:32:36 -06:00
= note: the caller chooses a type for `T` which can be different from `&'static str`
Suggest `impl Trait` return type Address #85991 Suggest the `impl Trait` return type syntax if the user tried to return a generic parameter and we get a type mismatch The suggestion is not emitted if the param appears in the function parameters, and only get the bounds that actually involve `T: ` directly It also checks whether the generic param is contained in any where bound (where it isn't the self type), and if one is found (like `Option<T>: Send`), it is not suggested. This also adds `TyS::contains`, which recursively vistits the type and looks if the other type is contained anywhere
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error[E0308]: mismatched types
--> $DIR/return-impl-trait-bad.rs:9:5
|
LL | fn bad_echo_2<T: Trait>(_t: T) -> T {
| - - expected `T` because of return type
| |
Tweak wording of type errors involving type params Fix #78206.
2023-10-18 17:10:48 -05:00
| expected this type parameter
Suggest `impl Trait` return type Address #85991 Suggest the `impl Trait` return type syntax if the user tried to return a generic parameter and we get a type mismatch The suggestion is not emitted if the param appears in the function parameters, and only get the bounds that actually involve `T: ` directly It also checks whether the generic param is contained in any where bound (where it isn't the self type), and if one is found (like `Option<T>: Send`), it is not suggested. This also adds `TyS::contains`, which recursively vistits the type and looks if the other type is contained anywhere
2021-10-14 14:44:43 -05:00
LL | "this will not suggest it, because that would probably be wrong"
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected type parameter `T`, found `&str`
|
= note: expected type parameter `T`
found reference `&'static str`
Note that type param is chosen by caller when suggesting return impl Trait
2024-03-09 14:32:36 -06:00
= note: the caller chooses a type for `T` which can be different from `&'static str`
Suggest `impl Trait` return type Address #85991 Suggest the `impl Trait` return type syntax if the user tried to return a generic parameter and we get a type mismatch The suggestion is not emitted if the param appears in the function parameters, and only get the bounds that actually involve `T: ` directly It also checks whether the generic param is contained in any where bound (where it isn't the self type), and if one is found (like `Option<T>: Send`), it is not suggested. This also adds `TyS::contains`, which recursively vistits the type and looks if the other type is contained anywhere
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error[E0308]: mismatched types
--> $DIR/return-impl-trait-bad.rs:17:5
|
LL | fn other_bounds_bad<T>() -> T
| - - expected `T` because of return type
| |
Tweak wording of type errors involving type params Fix #78206.
2023-10-18 17:10:48 -05:00
| expected this type parameter
Suggest `impl Trait` return type Address #85991 Suggest the `impl Trait` return type syntax if the user tried to return a generic parameter and we get a type mismatch The suggestion is not emitted if the param appears in the function parameters, and only get the bounds that actually involve `T: ` directly It also checks whether the generic param is contained in any where bound (where it isn't the self type), and if one is found (like `Option<T>: Send`), it is not suggested. This also adds `TyS::contains`, which recursively vistits the type and looks if the other type is contained anywhere
2021-10-14 14:44:43 -05:00
...
LL | "don't suggest this, because Option<T> places additional constraints"
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected type parameter `T`, found `&str`
|
= note: expected type parameter `T`
found reference `&'static str`
Note that type param is chosen by caller when suggesting return impl Trait
2024-03-09 14:32:36 -06:00
= note: the caller chooses a type for `T` which can be different from `&'static str`
Suggest `impl Trait` return type Address #85991 Suggest the `impl Trait` return type syntax if the user tried to return a generic parameter and we get a type mismatch The suggestion is not emitted if the param appears in the function parameters, and only get the bounds that actually involve `T: ` directly It also checks whether the generic param is contained in any where bound (where it isn't the self type), and if one is found (like `Option<T>: Send`), it is not suggested. This also adds `TyS::contains`, which recursively vistits the type and looks if the other type is contained anywhere
2021-10-14 14:44:43 -05:00
error[E0308]: mismatched types
--> $DIR/return-impl-trait-bad.rs:28:5
|
LL | fn used_in_trait<T>() -> T
| - -
| | |
| | expected `T` because of return type
| | help: consider using an impl return type: `impl Send`
Tweak wording of type errors involving type params Fix #78206.
2023-10-18 17:10:48 -05:00
| expected this type parameter
Suggest `impl Trait` return type Address #85991 Suggest the `impl Trait` return type syntax if the user tried to return a generic parameter and we get a type mismatch The suggestion is not emitted if the param appears in the function parameters, and only get the bounds that actually involve `T: ` directly It also checks whether the generic param is contained in any where bound (where it isn't the self type), and if one is found (like `Option<T>: Send`), it is not suggested. This also adds `TyS::contains`, which recursively vistits the type and looks if the other type is contained anywhere
2021-10-14 14:44:43 -05:00
...
LL | "don't suggest this, because the generic param is used in the bound."
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected type parameter `T`, found `&str`
|
= note: expected type parameter `T`
found reference `&'static str`
Note that type param is chosen by caller when suggesting return impl Trait
2024-03-09 14:32:36 -06:00
= note: the caller chooses a type for `T` which can be different from `&'static str`
Suggest `impl Trait` return type Address #85991 Suggest the `impl Trait` return type syntax if the user tried to return a generic parameter and we get a type mismatch The suggestion is not emitted if the param appears in the function parameters, and only get the bounds that actually involve `T: ` directly It also checks whether the generic param is contained in any where bound (where it isn't the self type), and if one is found (like `Option<T>: Send`), it is not suggested. This also adds `TyS::contains`, which recursively vistits the type and looks if the other type is contained anywhere
2021-10-14 14:44:43 -05:00
error: aborting due to 4 previous errors
For more information about this error, try `rustc --explain E0308`.
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