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error[E0277]: the trait bound `(): std::ops::FnMut<(_, char)>` is not satisfied
--> $DIR/issue-23966.rs:12:16
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LL | "".chars().fold(|_, _| (), ());
| ^^^^ 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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