39 lines
1.1 KiB
Rust
39 lines
1.1 KiB
Rust
// Copyright 2017 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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// Verify the binding mode shifts - only when no `&` are auto-dereferenced is the
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// final default binding mode mutable.
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fn main() {
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match &&Some(5i32) {
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Some(n) => {
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*n += 1; //~ ERROR cannot assign to immutable
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let _ = n;
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}
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None => {},
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};
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match &mut &Some(5i32) {
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Some(n) => {
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*n += 1; //~ ERROR cannot assign to immutable
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let _ = n;
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}
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None => {},
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};
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match &&mut Some(5i32) {
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Some(n) => {
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*n += 1; //~ ERROR cannot assign to immutable
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let _ = n;
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}
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None => {},
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};
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}
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