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Aug 20th, 2018
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  1. #![allow(unreachable_code)]
  2.  
  3.  
  4. fn main() {
  5. println!("{:?}", {
  6. let mut x = Some(1); match x { Some(ref _y) => x = None, _ => () }; x
  7. });
  8. }
  9.  
  10.  
  11. /* ~~~~=== stderr ===~~~~
  12. Compiling playground v0.0.1 (file:///playground)
  13. error[E0506]: cannot assign to `x` because it is borrowed
  14. --> src/main.rs:6:56
  15. |
  16. 6 | let mut x = Some(1); match x { Some(ref _y) => x = None, _ => () }; x
  17. | ------ ^^^^^^^^ assignment to borrowed `x` occurs here
  18. | |
  19. | borrow of `x` occurs here
  20.  
  21. error: aborting due to previous error
  22.  
  23. For more information about this error, try `rustc --explain E0506`.
  24. error: Could not compile `playground`.
  25.  
  26. To learn more, run the command again with --verbose.
  27.  
  28. */
  29.  
  30. /* ~~~~=== stdout ===~~~~
  31.  
  32. */
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