| // Copyright 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 free regions in the NLL code. This test ought to |
| // report an error due to a reborrowing constraint. Right now, we get |
| // a variety of errors from the older, AST-based machinery (notably |
| // borrowck), and then we get the NLL error at the end. |
| |
| // compile-flags:-Zborrowck=compare |
| |
| struct Map { |
| } |
| |
| impl Map { |
| fn get(&self) -> Option<&String> { None } |
| fn set(&mut self, v: String) { } |
| } |
| |
| fn ok(map: &mut Map) -> &String { |
| loop { |
| match map.get() { |
| Some(v) => { |
| return v; |
| } |
| None => { |
| map.set(String::new()); // Ideally, this would not error. |
| //~^ ERROR borrowed as immutable (Ast) |
| //~| ERROR borrowed as immutable (Mir) |
| } |
| } |
| } |
| } |
| |
| fn err(map: &mut Map) -> &String { |
| loop { |
| match map.get() { |
| Some(v) => { |
| map.set(String::new()); // Both AST and MIR error here |
| //~^ ERROR borrowed as immutable (Mir) |
| //~| ERROR borrowed as immutable (Ast) |
| return v; |
| } |
| None => { |
| map.set(String::new()); // Ideally, just AST would error here |
| //~^ ERROR borrowed as immutable (Ast) |
| //~| ERROR borrowed as immutable (Mir) |
| } |
| } |
| } |
| } |
| |
| fn main() { } |