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a guest Mar 25th, 2019 57 Never
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  1. #![allow(unreachable_code)]
  2.  
  3.  
  4. fn main() {
  5.     println!("{:?}", {
  6.         let a = 5; let b = &mut a.clone(); b += 1; a
  7.     });
  8. }
  9.  
  10.  
  11. /* ~~~~=== stderr ===~~~~
  12.    Compiling playground v0.0.1 (/playground)
  13. error[E0368]: binary assignment operation `+=` cannot be applied to type `&mut {integer}`
  14.  --> src/main.rs:6:44
  15.   |
  16. 6 |         let a = 5; let b = &mut a.clone(); b += 1; a
  17.   |                                            -^^^^^
  18.   |                                            |
  19.   |                                            cannot use `+=` on type `&mut {integer}`
  20. help: `+=` can be used on '{integer}', you can dereference `b`
  21.   |
  22. 6 |         let a = 5; let b = &mut a.clone(); *b += 1; a
  23.   |                                            ^^
  24.  
  25. error: aborting due to previous error
  26.  
  27. For more information about this error, try `rustc --explain E0368`.
  28. error: Could not compile `playground`.
  29.  
  30. To learn more, run the command again with --verbose.
  31.  
  32. */
  33.  
  34. /* ~~~~=== stdout ===~~~~
  35.  
  36. */
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