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error: future cannot be sent between threads safely
--> $DIR/issue-67252-unnamed-future.rs:21:5
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LL | spawn(async {
| ^^^^^ future created by async block is not `Send`
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= help: within `[async block@$DIR/issue-67252-unnamed-future.rs:21:11: 25:6]`, the trait `Send` is not implemented for `*mut ()`
note: future is not `Send` as this value is used across an await
--> $DIR/issue-67252-unnamed-future.rs:23:16
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LL | let a = std::ptr::null_mut::<()>(); // `*mut ()` is not `Send`
| - has type `*mut ()` which is not `Send`
LL | AFuture.await;
| ^^^^^^ await occurs here, with `a` maybe used later
note: required by a bound in `spawn`
--> $DIR/issue-67252-unnamed-future.rs:9:13
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LL | fn spawn<T: Send>(_: T) {}
| ^^^^ required by this bound in `spawn`
error: aborting due to previous error
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