1639e51f6e
Until some backwards-compatibility hazards are fixed in #23121, these need to be unstable. [breaking-change]
54 lines
1.2 KiB
Rust
54 lines
1.2 KiB
Rust
// Copyright 2012-2014 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 immutable pattern bindings cannot be reassigned.
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#![feature(slice_patterns)]
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enum E {
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Foo(isize)
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}
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struct S {
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bar: isize,
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}
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pub fn main() {
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match 1 {
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x => {
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x += 1; //~ ERROR re-assignment of immutable variable `x`
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}
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}
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match E::Foo(1) {
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E::Foo(x) => {
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x += 1; //~ ERROR re-assignment of immutable variable `x`
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}
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}
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match (S { bar: 1 }) {
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S { bar: x } => {
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x += 1; //~ ERROR re-assignment of immutable variable `x`
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}
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}
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match (1,) {
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(x,) => {
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x += 1; //~ ERROR re-assignment of immutable variable `x`
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}
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}
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match [1,2,3] {
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[x,_,_] => {
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x += 1; //~ ERROR re-assignment of immutable variable `x`
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}
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}
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}
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