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error[E0277]: `Foo<T, U>` cannot be sent between threads safely
--> $DIR/issue-83857-ub.rs:22:38
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LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i32) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `Foo<T, U>` cannot be sent between threads safely
|
= help: the trait `Send` is not implemented for `Foo<T, U>`
note: required for `Foo<T, U>` to implement `WithAssoc`
--> $DIR/issue-83857-ub.rs:15:15
|
LL | impl<T: Send> WithAssoc for T {
| ---- ^^^^^^^^^ ^
| |
| unsatisfied trait bound introduced here
help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
|
LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i32) where Foo<T, U>: Send {
| +++++++++++++++++++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
|
