mirror of https://github.com/rust-lang/rust
22 lines
727 B
Rust
22 lines
727 B
Rust
fn needs_fn<F>(x: F) where F: Fn(isize) -> isize {}
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fn main() {
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let _: () = Box::new(|_: isize| {}) as Box<dyn FnOnce(isize)>;
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//~^ ERROR mismatched types
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//~| expected unit type `()`
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//~| found struct `Box<dyn FnOnce(isize)>`
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let _: () = Box::new(|_: isize, isize| {}) as Box<dyn Fn(isize, isize)>;
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//~^ ERROR mismatched types
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//~| expected unit type `()`
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//~| found struct `Box<dyn Fn(isize, isize)>`
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let _: () = Box::new(|| -> isize { unimplemented!() }) as Box<dyn FnMut() -> isize>;
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//~^ ERROR mismatched types
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//~| expected unit type `()`
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//~| found struct `Box<dyn FnMut() -> isize>`
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needs_fn(1);
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//~^ ERROR expected a `Fn(isize)` closure, found `{integer}`
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}
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