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error[E0277]: expected a `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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| required by a bound introduced by this call
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= help: the trait `FnMut<(_, char)>` is not implemented for `()`
note: required by a bound in `fold`
--> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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