src/test/compile-fail/issue-30438-a.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 // Original regression test for Issue #30438.
  12
  13 use std::ops::Index;
  14
  15 struct Test<'a> {
  16     s: &'a String
  17 }
  18
  19 impl <'a> Index<usize> for Test<'a> {
  20     type Output = Test<'a>;
  21     fn index(&self, _: usize) -> &Self::Output {
  22         return &Test { s: &self.s};
  23         //~^ ERROR: borrowed value does not live long enough
  24     }
  25 }
  26
  27 fn main() {
  28     let s = "Hello World".to_string();
  29     let test = Test{s: &s};
  30     let r = &test[0];
  31     println!("{}", test.s); // OK since test is valid
  32     println!("{}", r.s); // Segfault since value pointed by r has already been dropped
  33 }