src/test/ui/nll/return_from_loop.rs

// Copyright 2012-2016 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.

// Basic test for liveness constraints: the region (`R1`) that appears
// in the type of `p` includes the points after `&v[0]` up to (but not
// including) the call to `use_x`. The `else` branch is not included.

// compile-flags:-Zborrowck=compare

#![allow(warnings)]
#![feature(rustc_attrs)]

struct MyStruct {
    field: String
}

fn main() {
}

fn nll_fail() {
    let mut my_struct = MyStruct { field: format!("Hello") };

    let value = &mut my_struct.field;
    loop {
        my_struct.field.push_str("Hello, world!");
        //~^ ERROR (Ast) [E0499]
        //~| ERROR (Mir) [E0499]
        value.len();
        return;
    }
}

fn nll_ok() {
    let mut my_struct = MyStruct { field: format!("Hello") };

    let value = &mut my_struct.field;
    loop {
        my_struct.field.push_str("Hello, world!");
        //~^ ERROR (Ast) [E0499]
        return;
    }
}