rust/src/test/ui/immut-function-arguments.rs

// Copyright 2012 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.

// revisions: ast mir
//[mir]compile-flags: -Z borrowck=mir

fn f(y: Box<isize>) {
    *y = 5; //[ast]~ ERROR cannot assign
            //[mir]~^ ERROR cannot assign
}

fn g() {
    let _frob = |q: Box<isize>| { *q = 2; }; //[ast]~ ERROR cannot assign
    //[mir]~^ ERROR cannot assign
}

fn main() {}