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default WF: Substitute defaults individually in the clauses.

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This commit is contained in:
leonardo.yvens 2017-12-21 13:36:16 -02:00
parent 87c2ad048a
commit d9c336afb7
3 changed files with 64 additions and 42 deletions
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6
src/test/ui/type-check-defaults.rs
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@ -29,4 +29,10 @@ trait SelfBound<T:Copy=Self> {}
trait FooTrait<T:Iterator = IntoIter<i32>> where T::Item : Add<u8> {}
trait Trait {}
struct TwoParams<T, U>(T, U);
impl Trait for TwoParams<i32, i32> {}
// Check that each default is substituted individually in the clauses.
struct Bogus<T = i32, U = i32>(TwoParams<T, U>) where TwoParams<T, U>: Trait;
fn main() { }

20
src/test/ui/type-check-defaults.stderr
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@ -67,5 +67,23 @@ error[E0277]: the trait bound `i32: std::ops::Add<u8>` is not satisfied
= help: the trait `std::ops::Add<u8>` is not implemented for `i32`
= note: required by `std::ops::Add`
error: aborting due to 8 previous errors
error[E0277]: the trait bound `TwoParams<i32, U>: Trait` is not satisfied
--> $DIR/type-check-defaults.rs:36:1
|
36 | struct Bogus<T = i32, U = i32>(TwoParams<T, U>) where TwoParams<T, U>: Trait;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Trait` is not implemented for `TwoParams<i32, U>`
|
= help: consider adding a `where TwoParams<i32, U>: Trait` bound
= note: required by `Trait`
error[E0277]: the trait bound `TwoParams<T, i32>: Trait` is not satisfied
--> $DIR/type-check-defaults.rs:36:1
|
36 | struct Bogus<T = i32, U = i32>(TwoParams<T, U>) where TwoParams<T, U>: Trait;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Trait` is not implemented for `TwoParams<T, i32>`
|
= help: consider adding a `where TwoParams<T, i32>: Trait` bound
= note: required by `Trait`
error: aborting due to 10 previous errors