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error: future cannot be sent between threads safely
--> $DIR/issue-64130-non-send-future-diags.rs:23:13
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LL | is_send(foo());
| ^^^^^ future returned by `foo` is not `Send`
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= help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `MutexGuard<'_, u32>`
note: future is not `Send` as this value is used across an await
--> $DIR/issue-64130-non-send-future-diags.rs:17:11
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LL | let g = x.lock().unwrap();
| - has type `MutexGuard<'_, u32>` which is not `Send`
LL | baz().await;
| ^^^^^ await occurs here, with `g` maybe used later
note: required by a bound in `is_send`
--> $DIR/issue-64130-non-send-future-diags.rs:9:15
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LL | fn is_send<T: Send>(t: T) { }
| ^^^^ required by this bound in `is_send`
error: aborting due to previous error
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