src/test/ui/reassign-ref-mut.rs


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// Copyright 2017 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.

// Tests how we behave when the user attempts to mutate an immutable
// binding that was introduced by either `ref` or `ref mut`
// patterns.
//
// Such bindings cannot be made mutable via the mere addition of the
// `mut` keyword, and thus we want to check that the compiler does not
// suggest doing so.

fn main() {
    let (mut one_two, mut three_four) = ((1, 2), (3, 4));
    let &mut (ref a, ref mut b) = &mut one_two;
    a = &three_four.0;
    //~^ ERROR cannot assign twice to immutable variable `a` [E0384]
    b = &mut three_four.1;
    //~^ ERROR cannot assign twice to immutable variable `b` [E0384]
}