rust/src/test/ui/unboxed-closures/unboxed-closures-fnmut-as-fn.stderr

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error[E0277]: expected a `std::ops::Fn<(isize,)>` closure, found `S`
--> $DIR/unboxed-closures-fnmut-as-fn.rs:28:21
|
LL | fn call_it<F:Fn(isize)->isize>(f: &F, x: isize) -> isize {
| ------- ---------------- required by this bound in `call_it`
...
LL | let x = call_it(&S, 22);
| ^^ expected an `Fn<(isize,)>` closure, found `S`
|
= help: the trait `std::ops::Fn<(isize,)>` is not implemented for `S`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.