| // 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. |
| |
| // cmpile-flags: -Z borrowck=mir -Z two-phase-borrows |
| |
| // This is the first counter-example from Niko's blog post |
| // smallcultfollowing.com/babysteps/blog/2017/03/01/nested-method-calls-via-two-phase-borrowing/ |
| // of a danger for code to crash if we just turned off the check for whether |
| // a mutable-borrow aliases another borrow. |
| |
| fn main() { |
| let mut v: Vec<String> = vec![format!("Hello, ")]; |
| v[0].push_str({ |
| |
| v.push(format!("foo")); |
| //~^ ERROR cannot borrow `v` as mutable more than once at a time [E0499] |
| |
| "World!" |
| }); |
| } |
