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.
33 lines
1.0 KiB
Rust
33 lines
1.0 KiB
Rust
// Copyright 2015 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.
|
|
|
|
#![feature(unboxed_closures)]
|
|
|
|
struct Foo;
|
|
|
|
impl<'a, T> Fn<(&'a T,)> for Foo {
|
|
extern "rust-call" fn call(&self, (_,): (T,)) {}
|
|
//~^ ERROR: has an incompatible type for trait: expected &-ptr
|
|
}
|
|
|
|
impl<'a, T> FnMut<(&'a T,)> for Foo {
|
|
extern "rust-call" fn call_mut(&mut self, (_,): (T,)) {}
|
|
//~^ ERROR: has an incompatible type for trait: expected &-ptr
|
|
}
|
|
|
|
impl<'a, T> FnOnce<(&'a T,)> for Foo {
|
|
type Output = ();
|
|
|
|
extern "rust-call" fn call_once(self, (_,): (T,)) {}
|
|
//~^ ERROR: has an incompatible type for trait: expected &-ptr
|
|
}
|
|
|
|
fn main() {}
|