src/test/ui/issues/issue-30438-b.rs

   1 // Modified regression test for Issue #30438 that exposed an
   2 // independent issue (see discussion on ticket).
   3
   4 use std::ops::Index;
   5
   6 struct Test<'a> {
   7     s: &'a String
   8 }
   9
  10 impl <'a> Index<usize> for Test<'a> {
  11     type Output = Test<'a>;
  12     fn index(&self, _: usize) -> &Self::Output {
  13         &Test { s: &self.s}
  14         //~^ ERROR: cannot return reference to temporary value
  15     }
  16 }
  17
  18 fn main() {
  19     let s = "Hello World".to_string();
  20     let test = Test{s: &s};
  21     let r = &test[0];
  22     println!("{}", test.s); // OK since test is valid
  23     println!("{}", r.s); // Segfault since value pointed by r has already been dropped
  24 }