22 lines
727 B
Rust
22 lines
727 B
Rust
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}`
|
|
}
|