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error[E0277]: `()` is not a future
--> $DIR/async-error-span.rs:7:20
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LL | fn get_future() -> impl Future<Output = ()> {
| ^^^^^^^^^^^^^^^^^^^^^^^^ `()` is not a future
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= help: the trait `Future` is not implemented for `()`
error[E0282]: type annotations needed
--> $DIR/async-error-span.rs:13:9
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LL | let a;
| ^
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help: consider giving `a` an explicit type
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LL | let a: /* Type */;
| ++++++++++++
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0277, E0282.
For more information about an error, try `rustc --explain E0277`.
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