src/test/ui/nll/get_default.rs

   1 // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // Basic test for free regions in the NLL code. This test ought to
  12 // report an error due to a reborrowing constraint. Right now, we get
  13 // a variety of errors from the older, AST-based machinery (notably
  14 // borrowck), and then we get the NLL error at the end.
  15
  16 // compile-flags:-Znll -Zborrowck-mir
  17
  18 struct Map {
  19 }
  20
  21 impl Map {
  22     fn get(&self) -> Option<&String> { None }
  23     fn set(&mut self, v: String) { }
  24 }
  25
  26 fn ok(map: &mut Map) -> &String {
  27     loop {
  28         match map.get() {
  29             Some(v) => {
  30                 return v;
  31             }
  32             None => {
  33                 map.set(String::new()); // Just AST errors here
  34             }
  35         }
  36     }
  37 }
  38
  39 fn err(map: &mut Map) -> &String {
  40     loop {
  41         match map.get() {
  42             Some(v) => {
  43                 map.set(String::new()); // Both AST and MIR error here
  44                 return v;
  45             }
  46             None => {
  47                 map.set(String::new()); // Just AST errors here
  48             }
  49         }
  50     }
  51 }
  52
  53 fn main() { }