09783d1dab
explicit form `Fn<A,B>` and now should use `Fn(A) -> B` or `Fn<A,Output=B>`, but in some cases we get duplicate error reports. This is mildly annoying and arises because of the main error and another error from the projection. Might be worth squashing those, but seems like a separate problem.
74 lines
1.4 KiB
Rust
74 lines
1.4 KiB
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(lang_items, unboxed_closures)]
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use std::ops::{Fn, FnMut, FnOnce};
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struct S1 {
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x: i32,
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y: i32,
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}
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impl FnMut<(i32,)> for S1 {
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type Output = i32;
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extern "rust-call" fn call_mut(&mut self, (z,): (i32,)) -> i32 {
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self.x * self.y * z
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}
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}
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struct S2 {
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x: i32,
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y: i32,
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}
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impl Fn<(i32,)> for S2 {
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type Output = i32;
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extern "rust-call" fn call(&self, (z,): (i32,)) -> i32 {
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self.x * self.y * z
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}
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}
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struct S3 {
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x: i32,
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y: i32,
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}
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impl FnOnce<(i32,i32)> for S3 {
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type Output = i32;
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extern "rust-call" fn call_once(self, (z,zz): (i32,i32)) -> i32 {
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self.x * self.y * z * zz
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}
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}
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fn main() {
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let mut s = S1 {
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x: 3,
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y: 3,
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};
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let ans = s(3);
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assert_eq!(ans, 27);
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let s = S2 {
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x: 3,
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y: 3,
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};
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let ans = s.call((3,));
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assert_eq!(ans, 27);
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let s = S3 {
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x: 3,
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y: 3,
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};
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let ans = s(3, 1);
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assert_eq!(ans, 27);
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}
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