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error[E0271]: expected `{async closure@is-not-fn.rs:7:14}` to be a closure that returns `()`, but it returns `{async closure body@$DIR/is-not-fn.rs:7:23: 7:25}`
--> $DIR/is-not-fn.rs:7:14
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LL | needs_fn(async || {});
| -------- ^^^^^^^^^^^ expected `()`, found `async` closure body
| |
| required by a bound introduced by this call
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= note: expected unit type `()`
found `async` closure body `{async closure body@$DIR/is-not-fn.rs:7:23: 7:25}`
note: required by a bound in `needs_fn`
--> $DIR/is-not-fn.rs:6:25
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LL | fn needs_fn(x: impl FnOnce()) {}
| ^^^^^^^^ required by this bound in `needs_fn`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0271`.
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