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