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When encountering an unmet trait bound, point at local type that doesn't implement the trait: ``` error[E0277]: the trait bound `Bar<T>: Foo` is not satisfied --> $DIR/issue-64855.rs:9:19 | LL | pub struct Bar<T>(<Self as Foo>::Type) where Self: ; | ^^^^^^^^^^^^^^^^^^^ unsatisfied trait bound | help: the trait `Foo` is not implemented for `Bar<T>` --> $DIR/issue-64855.rs:9:1 | LL | pub struct Bar<T>(<Self as Foo>::Type) where Self: ; | ^^^^^^^^^^^^^^^^^ ```
73 lines
3.1 KiB
Plaintext
73 lines
3.1 KiB
Plaintext
error[E0277]: `Foo<T, U>` cannot be sent between threads safely
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--> $DIR/issue-83857-ub.rs:21:38
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LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i32) {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `Foo<T, U>` cannot be sent between threads safely
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help: the trait `Send` is not implemented for `Foo<T, U>`
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--> $DIR/issue-83857-ub.rs:6:1
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LL | struct Foo<T, U>(Always<T, U>);
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| ^^^^^^^^^^^^^^^^
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note: required for `Foo<T, U>` to implement `WithAssoc`
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--> $DIR/issue-83857-ub.rs:14:15
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LL | impl<T: Send> WithAssoc for T {
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| ---- ^^^^^^^^^ ^
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| |
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| unsatisfied trait bound introduced here
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help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
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LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i32) where Foo<T, U>: Send {
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| +++++++++++++++++++++
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error[E0277]: `Foo<T, U>` cannot be sent between threads safely
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--> $DIR/issue-83857-ub.rs:21:35
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LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i32) {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `Foo<T, U>` cannot be sent between threads safely
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help: the trait `Send` is not implemented for `Foo<T, U>`
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--> $DIR/issue-83857-ub.rs:6:1
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LL | struct Foo<T, U>(Always<T, U>);
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| ^^^^^^^^^^^^^^^^
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note: required for `Foo<T, U>` to implement `WithAssoc`
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--> $DIR/issue-83857-ub.rs:14:15
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LL | impl<T: Send> WithAssoc for T {
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| ---- ^^^^^^^^^ ^
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| |
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| unsatisfied trait bound introduced here
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help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
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LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i32) where Foo<T, U>: Send {
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| +++++++++++++++++++++
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error[E0277]: `Foo<T, U>` cannot be sent between threads safely
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--> $DIR/issue-83857-ub.rs:24:11
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LL | f(foo(v));
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| --- ^ `Foo<T, U>` cannot be sent between threads safely
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| |
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| required by a bound introduced by this call
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help: the trait `Send` is not implemented for `Foo<T, U>`
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--> $DIR/issue-83857-ub.rs:6:1
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LL | struct Foo<T, U>(Always<T, U>);
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| ^^^^^^^^^^^^^^^^
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note: required by a bound in `foo`
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--> $DIR/issue-83857-ub.rs:28:11
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LL | fn foo<T: Send>(x: T) -> <T as WithAssoc>::Output {
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| ^^^^ required by this bound in `foo`
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help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
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LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i32) where Foo<T, U>: Send {
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| +++++++++++++++++++++
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error: aborting due to 3 previous errors
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For more information about this error, try `rustc --explain E0277`.
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