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`. |