tests/ui/issues/issue-19367.rs

   1 // run-pass
   2 struct S {
   3     o: Option<String>
   4 }
   5
   6 // Make sure we don't reuse the same alloca when matching
   7 // on field of struct or tuple which we reassign in the match body.
   8
   9 fn main() {
  10     let mut a = (0, Some("right".to_string()));
  11     let b = match a.1 {
  12         Some(v) => {
  13             a.1 = Some("wrong".to_string());
  14             v
  15         }
  16         None => String::new()
  17     };
  18     println!("{}", b);
  19     assert_eq!(b, "right");
  20
  21
  22     let mut s = S{ o: Some("right".to_string()) };
  23     let b = match s.o {
  24         Some(v) => {
  25             s.o = Some("wrong".to_string());
  26             v
  27         }
  28         None => String::new(),
  29     };
  30     println!("{}", b);
  31     assert_eq!(b, "right");
  32 }