rust/tests/ui/mut_range_bound.rs

// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// 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.

#![allow(unused)]

fn main() {
    mut_range_bound_upper();
    mut_range_bound_lower();
    mut_range_bound_both();
    mut_range_bound_no_mutation();
    immut_range_bound();
    mut_borrow_range_bound();
    immut_borrow_range_bound();
}

fn mut_range_bound_upper() {
    let mut m = 4;
    for i in 0..m {
        m = 5;
    } // warning
}

fn mut_range_bound_lower() {
    let mut m = 4;
    for i in m..10 {
        m *= 2;
    } // warning
}

fn mut_range_bound_both() {
    let mut m = 4;
    let mut n = 6;
    for i in m..n {
        m = 5;
        n = 7;
    } // warning (1 for each mutated bound)
}

fn mut_range_bound_no_mutation() {
    let mut m = 4;
    for i in 0..m {
        continue;
    } // no warning
}

fn mut_borrow_range_bound() {
    let mut m = 4;
    for i in 0..m {
        let n = &mut m; // warning
        *n += 1;
    }
}

fn immut_borrow_range_bound() {
    let mut m = 4;
    for i in 0..m {
        let n = &m; // should be no warning?
    }
}

fn immut_range_bound() {
    let m = 4;
    for i in 0..m {
        continue;
    } // no warning
}