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fn needs_fn<F>(x: F) where F: Fn(isize) -> isize {}
fn main() {
let _: () = Box::new(|_: isize| {}) as Box<dyn FnOnce(isize)>;
//~^ ERROR mismatched types
//~| expected unit type `()`
//~| found struct `Box<dyn FnOnce(isize)>`
let _: () = Box::new(|_: isize, isize| {}) as Box<dyn Fn(isize, isize)>;
//~^ ERROR mismatched types
//~| expected unit type `()`
//~| found struct `Box<dyn Fn(isize, isize)>`
let _: () = Box::new(|| -> isize { unimplemented!() }) as Box<dyn FnMut() -> isize>;
//~^ ERROR mismatched types
//~| expected unit type `()`
//~| found struct `Box<dyn FnMut() -> isize>`
needs_fn(1);
//~^ ERROR expected a `Fn(isize)` closure, found `{integer}`
}
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