| // 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!" | |
| }); | |
| } |