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error[E0271]: type mismatch resolving `() == i32`
--> $DIR/async.rs:12:17
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LL | needs_async(async {});
| ----------- ^^^^^^^^ types differ
| |
| required by a bound introduced by this call
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note: required by a bound in `needs_async`
--> $DIR/async.rs:8:31
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LL | fn needs_async(_: impl Future<Output = i32>) {}
| ^^^^^^^^^^^^ required by this bound in `needs_async`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0271`.
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