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.
81 lines
1.7 KiB
Rust
81 lines
1.7 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(unboxed_closures)]
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use std::ops::{Fn, FnMut, FnOnce};
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struct SFn {
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x: isize,
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y: isize,
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}
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impl Fn<(isize,)> for SFn {
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type Output = isize;
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extern "rust-call" fn call(&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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struct SFnMut {
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x: isize,
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y: isize,
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}
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impl FnMut<(isize,)> for SFnMut {
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type Output = isize;
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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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struct SFnOnce {
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x: String,
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}
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impl FnOnce<(String,)> for SFnOnce {
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type Output = usize;
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extern "rust-call" fn call_once(self, (z,): (String,)) -> usize {
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self.x.len() + z.len()
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}
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}
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fn f() {
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let mut s = SFn {
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x: 1,
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y: 2,
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};
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let sp = &mut s;
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s(3); //~ ERROR cannot borrow `s` as immutable because it is also borrowed as mutable
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//~^ ERROR cannot borrow `s` as immutable because it is also borrowed as mutable
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}
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fn g() {
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let s = SFnMut {
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x: 1,
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y: 2,
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};
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s(3); //~ ERROR cannot borrow immutable local variable `s` as mutable
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}
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fn h() {
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let s = SFnOnce {
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x: "hello".to_string(),
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};
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s(" world".to_string());
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s(" world".to_string()); //~ ERROR use of moved value: `s`
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}
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fn main() {}
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