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error[E0277]: expected a `std::ops::FnMut<(_, char)>` closure, found `()`
--> $DIR/issue-23966.rs:2:32
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LL | "".chars().fold(|_, _| (), ());
| ^^ expected an `FnMut<(_, char)>` closure, found `()`
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= help: the trait `std::ops::FnMut<(_, char)>` is not implemented for `()`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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