| // Copyright 2014 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. |
| |
| // Test that we still see borrowck errors of various kinds when using |
| // indexing and autoderef in combination. |
| |
| use std::ops::{Index, IndexMut}; |
| |
| |
| |
| struct Foo { |
| x: isize, |
| y: isize, |
| } |
| |
| impl<'a> Index<&'a String> for Foo { |
| type Output = isize; |
| |
| fn index(&self, z: &String) -> &isize { |
| if *z == "x" { |
| &self.x |
| } else { |
| &self.y |
| } |
| } |
| } |
| |
| impl<'a> IndexMut<&'a String> for Foo { |
| fn index_mut(&mut self, z: &String) -> &mut isize { |
| if *z == "x" { |
| &mut self.x |
| } else { |
| &mut self.y |
| } |
| } |
| } |
| |
| fn test1(mut f: Box<Foo>, s: String) { |
| let p = &mut f[&s]; |
| let q = &f[&s]; //~ ERROR cannot borrow |
| p.use_mut(); |
| } |
| |
| fn test2(mut f: Box<Foo>, s: String) { |
| let p = &mut f[&s]; |
| let q = &mut f[&s]; //~ ERROR cannot borrow |
| p.use_mut(); |
| } |
| |
| struct Bar { |
| foo: Foo |
| } |
| |
| fn test3(mut f: Box<Bar>, s: String) { |
| let p = &mut f.foo[&s]; |
| let q = &mut f.foo[&s]; //~ ERROR cannot borrow |
| p.use_mut(); |
| } |
| |
| fn test4(mut f: Box<Bar>, s: String) { |
| let p = &f.foo[&s]; |
| let q = &f.foo[&s]; |
| p.use_ref(); |
| } |
| |
| fn test5(mut f: Box<Bar>, s: String) { |
| let p = &f.foo[&s]; |
| let q = &mut f.foo[&s]; //~ ERROR cannot borrow |
| p.use_ref(); |
| } |
| |
| fn test6(mut f: Box<Bar>, g: Foo, s: String) { |
| let p = &f.foo[&s]; |
| f.foo = g; //~ ERROR cannot assign |
| p.use_ref(); |
| } |
| |
| fn test7(mut f: Box<Bar>, g: Bar, s: String) { |
| let p = &f.foo[&s]; |
| *f = g; //~ ERROR cannot assign |
| p.use_ref(); |
| } |
| |
| fn test8(mut f: Box<Bar>, g: Foo, s: String) { |
| let p = &mut f.foo[&s]; |
| f.foo = g; //~ ERROR cannot assign |
| p.use_mut(); |
| } |
| |
| fn test9(mut f: Box<Bar>, g: Bar, s: String) { |
| let p = &mut f.foo[&s]; |
| *f = g; //~ ERROR cannot assign |
| p.use_mut(); |
| } |
| |
| fn main() { |
| } |
| |
| trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } } |
| impl<T> Fake for T { } |