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Handle more specific case E0222

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This commit is contained in:
Esteban Küber 2019-12-12 21:15:19 -08:00
parent 8e74f63054
commit 66ea471f9d
7 changed files with 167 additions and 60 deletions
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4
src/test/ui/associated-type/associated-type-projection-from-multiple-supertraits.rs
View file

@ -20,11 +20,9 @@ fn dent<C:BoxCar>(c: C, color: C::Color) {
//~^ ERROR ambiguous associated type `Color` in bounds of `C`
}
// FIXME: add error code to detect this case and explain that you'll want the approach in
// `dent_object_3` of using a new type param and relying on the `where` clauses.
fn dent_object<COLOR>(c: dyn BoxCar<Color=COLOR>) {
//~^ ERROR ambiguous associated type
//~| ERROR the value of the associated type `Color` (from trait `Vehicle`) must be specified
//~| ERROR the value of the associated types `Color` (from trait `Vehicle`), `Color` (from
}
fn paint<C:BoxCar>(c: C, d: C::Color) {

46
src/test/ui/associated-type/associated-type-projection-from-multiple-supertraits.stderr
View file

@ -1,8 +1,10 @@
error: equality constraints are not yet supported in where clauses (see #20041)
--> $DIR/associated-type-projection-from-multiple-supertraits.rs:34:46
error: equality constraints are not yet supported in where clauses
--> $DIR/associated-type-projection-from-multiple-supertraits.rs:32:46
|
LL | fn dent_object_2<COLOR>(c: dyn BoxCar) where <dyn BoxCar as Vehicle>::Color = COLOR {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not supported
|
= note: for more information, see #20041
error[E0221]: ambiguous associated type `Color` in bounds of `C`
--> $DIR/associated-type-projection-from-multiple-supertraits.rs:19:32
@ -25,8 +27,8 @@ help: use fully qualified syntax to disambiguate
LL | fn dent<C:BoxCar>(c: C, color: <C as Vehicle>::Color) {
| ^^^^^^^^^^^^^^^^^^^^^
error[E0221]: ambiguous associated type `Color` in bounds of `BoxCar`
--> $DIR/associated-type-projection-from-multiple-supertraits.rs:25:30
error[E0222]: ambiguous associated type `Color` in bounds of `BoxCar`
--> $DIR/associated-type-projection-from-multiple-supertraits.rs:23:30
|
LL | type Color;
| ----------- ambiguous `Color` from `Vehicle`
@ -37,26 +39,28 @@ LL | type Color;
LL | fn dent_object<COLOR>(c: dyn BoxCar<Color=COLOR>) {
| ^^^^^^^^^^^^^^^^^^^ ambiguous associated type `Color`
|
help: use fully qualified syntax to disambiguate
|
LL | fn dent_object<COLOR>(c: dyn <BoxCar as Box>::Color) {
| ^^^^^^^^^^^^^^^^^^^^^^
help: use fully qualified syntax to disambiguate
|
LL | fn dent_object<COLOR>(c: dyn <BoxCar as Vehicle>::Color) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
= help: consider introducing a new type parameter `T` and adding `where` constraints:
where
T: BoxCar,
T: Box::Color = COLOR,
T: Vehicle::Color = COLOR
error[E0191]: the value of the associated type `Color` (from trait `Vehicle`) must be specified
--> $DIR/associated-type-projection-from-multiple-supertraits.rs:25:30
error[E0191]: the value of the associated types `Color` (from trait `Vehicle`), `Color` (from trait `Box`) must be specified
--> $DIR/associated-type-projection-from-multiple-supertraits.rs:23:30
|
LL | type Color;
| ----------- `Color` defined here
...
LL | type Color;
| ----------- `Color` defined here
...
LL | fn dent_object<COLOR>(c: dyn BoxCar<Color=COLOR>) {
| ^^^^^^^^^^^^^^^^^^^ help: specify the associated type: `BoxCar<Color=COLOR, Color = Type>`
| ^^^^^^^^^^^^^^^^^^^ associated types `Color`, `Color` must be specified
|
= help: consider introducing a new type parameter, adding `where` constraints using the fully-qualified path to the associated type
error[E0221]: ambiguous associated type `Color` in bounds of `C`
--> $DIR/associated-type-projection-from-multiple-supertraits.rs:30:29
--> $DIR/associated-type-projection-from-multiple-supertraits.rs:28:29
|
LL | type Color;
| ----------- ambiguous `Color` from `Vehicle`
@ -77,7 +81,7 @@ LL | fn paint<C:BoxCar>(c: C, d: <C as Vehicle>::Color) {
| ^^^^^^^^^^^^^^^^^^^^^
error[E0191]: the value of the associated types `Color` (from trait `Vehicle`), `Color` (from trait `Box`) must be specified
--> $DIR/associated-type-projection-from-multiple-supertraits.rs:34:32
--> $DIR/associated-type-projection-from-multiple-supertraits.rs:32:32
|
LL | type Color;
| ----------- `Color` defined here
@ -86,9 +90,11 @@ LL | type Color;
| ----------- `Color` defined here
...
LL | fn dent_object_2<COLOR>(c: dyn BoxCar) where <dyn BoxCar as Vehicle>::Color = COLOR {
| ^^^^^^ help: specify the associated types: `BoxCar<Color = Type, Color = Type>`
| ^^^^^^ associated types `Color`, `Color` must be specified
|
= help: consider introducing a new type parameter, adding `where` constraints using the fully-qualified path to the associated type
error: aborting due to 6 previous errors
Some errors have detailed explanations: E0191, E0221.
Some errors have detailed explanations: E0191, E0221, E0222.
For more information about an error, try `rustc --explain E0191`.

4
src/test/ui/where-clauses/where-equality-constraints.stderr
View file

@ -2,7 +2,7 @@ error: equality constraints are not yet supported in `where` clauses
--> $DIR/where-equality-constraints.rs:1:14
|
LL | fn f() where u8 = u16 {}
| ^^^^^^^^
| ^^^^^^^^ not supported
|
= note: for more information, see https://github.com/rust-lang/rust/issues/20041
@ -10,7 +10,7 @@ error: equality constraints are not yet supported in `where` clauses
--> $DIR/where-equality-constraints.rs:3:14
|
LL | fn g() where for<'a> &'static (u8,) == u16, {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not supported
|
= note: for more information, see https://github.com/rust-lang/rust/issues/20041