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error[E0525]: expected a closure that implements the `Fn` trait, but this closure only implements `FnMut`
--> $DIR/issue-34349.rs:16:17
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LL | let diary = || {
| ^^ this closure implements `FnMut`, not `Fn`
LL | farewell.push_str("!!!");
| -------- closure is `FnMut` because it mutates the variable `farewell` here
...
LL | apply(diary);
| ----- the requirement to implement `Fn` derives from here
error: aborting due to previous error
For more information about this error, try `rustc --explain E0525`.
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