56290a0044
This commit is an implementation of [RFC 503][rfc] which is a stabilization story for the prelude. Most of the RFC was directly applied, removing reexports. Some reexports are kept around, however: * `range` remains until range syntax has landed to reduce churn. * `Path` and `GenericPath` remain until path reform lands. This is done to prevent many imports of `GenericPath` which will soon be removed. * All `io` traits remain until I/O reform lands so imports can be rewritten all at once to `std::io::prelude::*`. This is a breaking change because many prelude reexports have been removed, and the RFC can be consulted for the exact list of removed reexports, as well as to find the locations of where to import them. [rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md [breaking-change] Closes #20068
66 lines
1.5 KiB
Rust
66 lines
1.5 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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use std::ops::{Index, IndexMut};
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struct Foo {
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x: int,
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y: int,
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}
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impl Index<String,int> for Foo {
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fn index<'a>(&'a self, z: &String) -> &'a int {
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if z.as_slice() == "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 IndexMut<String,int> for Foo {
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fn index_mut<'a>(&'a mut self, z: &String) -> &'a mut int {
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if z.as_slice() == "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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struct Bar {
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x: int,
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}
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impl Index<int,int> for Bar {
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fn index<'a>(&'a self, z: &int) -> &'a int {
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&self.x
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}
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}
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fn main() {
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let mut f = Foo {
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x: 1,
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y: 2,
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};
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let mut s = "hello".to_string();
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let rs = &mut s;
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println!("{}", f[s]);
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//~^ ERROR cannot borrow `s` as immutable because it is also borrowed as mutable
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f[s] = 10;
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//~^ ERROR cannot borrow `s` as immutable because it is also borrowed as mutable
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let s = Bar {
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x: 1,
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};
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s[2] = 20;
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//~^ ERROR cannot assign to immutable dereference (dereference is implicit, due to indexing)
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}
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