9330bae4bd
impls. This is a [breaking-change] (for gated code) in that when you implement `Fn` (`FnMut`) you must also implement `FnOnce`. This commit demonstrates how to fix it.
38 lines
953 B
Rust
38 lines
953 B
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(unboxed_closures)]
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use std::ops::FnMut;
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struct S {
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x: isize,
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y: isize,
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}
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impl FnMut<isize> for S {
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extern "rust-call" fn call_mut(&mut self, z: isize) -> isize {
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self.x + self.y + z
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}
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}
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impl FnOnce<isize> for S {
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type Output = isize;
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extern "rust-call" fn call_once(mut self, z: isize) -> isize { self.call_mut(z) }
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}
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fn main() {
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let mut s = S {
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x: 1,
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y: 2,
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};
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drop(s(3)) //~ ERROR cannot use call notation
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}
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