src/test/compile-fail/borrowck-overloaded-call.rs

   1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![feature(unboxed_closures)]
  12
  13 use std::ops::{Fn, FnMut, FnOnce};
  14
  15 struct SFn {
  16     x: isize,
  17     y: isize,
  18 }
  19
  20 impl Fn<(isize,)> for SFn {
  21     type Output = isize;
  22
  23     extern "rust-call" fn call(&self, (z,): (isize,)) -> isize {
  24         self.x * self.y * z
  25     }
  26 }
  27
  28 struct SFnMut {
  29     x: isize,
  30     y: isize,
  31 }
  32
  33 impl FnMut<(isize,)> for SFnMut {
  34     type Output = isize;
  35
  36     extern "rust-call" fn call_mut(&mut self, (z,): (isize,)) -> isize {
  37         self.x * self.y * z
  38     }
  39 }
  40
  41 struct SFnOnce {
  42     x: String,
  43 }
  44
  45 impl FnOnce<(String,)> for SFnOnce {
  46     type Output = usize;
  47
  48     extern "rust-call" fn call_once(self, (z,): (String,)) -> usize {
  49         self.x.len() + z.len()
  50     }
  51 }
  52
  53 fn f() {
  54     let mut s = SFn {
  55         x: 1,
  56         y: 2,
  57     };
  58     let sp = &mut s;
  59     s(3);   //~ ERROR cannot borrow `s` as immutable because it is also borrowed as mutable
  60     //~^ ERROR cannot borrow `s` as immutable because it is also borrowed as mutable
  61 }
  62
  63 fn g() {
  64     let s = SFnMut {
  65         x: 1,
  66         y: 2,
  67     };
  68     s(3);   //~ ERROR cannot borrow immutable local variable `s` as mutable
  69 }
  70
  71 fn h() {
  72     let s = SFnOnce {
  73         x: "hello".to_string(),
  74     };
  75     s(" world".to_string());
  76     s(" world".to_string());    //~ ERROR use of moved value: `s`
  77 }
  78
  79 fn main() {}
  80