rust/src/test/compile-fail/fn-trait-formatting.rs

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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
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#![feature(box_syntax)]
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fn needs_fn<F>(x: F) where F: Fn(isize) -> isize {}
fn main() {
let _: () = (box |_: isize| {}) as Box<FnOnce(isize)>;
//~^ ERROR mismatched types
//~| expected type `()`
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//~| found type `std::boxed::Box<std::ops::FnOnce(isize)>`
let _: () = (box |_: isize, isize| {}) as Box<Fn(isize, isize)>;
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//~^ ERROR mismatched types
//~| expected type `()`
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//~| found type `std::boxed::Box<std::ops::Fn(isize, isize)>`
let _: () = (box || -> isize { unimplemented!() }) as Box<FnMut() -> isize>;
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//~^ ERROR mismatched types
//~| expected type `()`
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//~| found type `std::boxed::Box<std::ops::FnMut() -> isize>`
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needs_fn(1);
//~^ ERROR : std::ops::Fn<(isize,)>`
}