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error[E0277]: expected a `Fn(isize)` closure, found `S`
--> $DIR/unboxed-closures-fnmut-as-fn.rs:27:21
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LL | let x = call_it(&S, 22);
| ------- ^^ expected an `Fn(isize)` closure, found `S`
| |
| required by a bound introduced by this call
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= help: the trait `Fn<(isize,)>` is not implemented for `S`
= note: `S` implements `FnMut`, but it must implement `Fn`, which is more general
note: required by a bound in `call_it`
--> $DIR/unboxed-closures-fnmut-as-fn.rs:22:14
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LL | fn call_it<F:Fn(isize)->isize>(f: &F, x: isize) -> isize {
| ^^^^^^^^^^^^^^^^ required by this bound in `call_it`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.
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