22 lines
784 B
Rust
22 lines
784 B
Rust
#![feature(box_syntax)]
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fn needs_fn<F>(x: F) where F: Fn(isize) -> isize {}
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fn main() {
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let _: () = (box |_: isize| {}) as Box<FnOnce(isize)>;
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//~^ ERROR mismatched types
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//~| expected type `()`
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//~| found type `std::boxed::Box<dyn std::ops::FnOnce(isize)>`
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let _: () = (box |_: isize, isize| {}) as Box<Fn(isize, isize)>;
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//~^ ERROR mismatched types
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//~| expected type `()`
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//~| found type `std::boxed::Box<dyn std::ops::Fn(isize, isize)>`
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let _: () = (box || -> isize { unimplemented!() }) as Box<FnMut() -> isize>;
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//~^ ERROR mismatched types
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//~| expected type `()`
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//~| found type `std::boxed::Box<dyn std::ops::FnMut() -> isize>`
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needs_fn(1);
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//~^ ERROR expected a `std::ops::Fn<(isize,)>` closure, found `{integer}`
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}
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