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error[E0271]: type mismatch resolving `{async closure body@$DIR/is-not-fn.rs:8:23: 8:25} == ()`
--> $DIR/is-not-fn.rs:8:14
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LL | needs_fn(async || {});
| -------- ^^^^^^^^^^^ types differ
| |
| required by a bound introduced by this call
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note: required by a bound in `needs_fn`
--> $DIR/is-not-fn.rs:7:25
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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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