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Feb 23rd, 2019
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  1. #![allow(unreachable_code)]
  2.  
  3.  
  4. fn main() {
  5. println!("{:?}", {
  6. struct Foo(String); impl Deref for Foo { type Target = String; fn deref(&self) -> &Self::Target { &self.0 } } fn x(_y: &str) {} x(&Foo(String::new()));
  7. });
  8. }
  9.  
  10.  
  11. /* ~~~~=== stderr ===~~~~
  12. Compiling playground v0.0.1 (/playground)
  13. error[E0405]: cannot find trait `Deref` in this scope
  14. --> src/main.rs:6:34
  15. |
  16. 6 | struct Foo(String); impl Deref for Foo { type Target = String; fn deref(&self) -> &Self::Target { &self.0 } } fn x(_y: &str) {} x(&Foo(String::new()));
  17. | ^^^^^ not found in this scope
  18. help: possible candidates are found in other modules, you can import them into scope
  19. |
  20. 4 | use core::ops::Deref;
  21. |
  22. 4 | use std::ops::Deref;
  23. |
  24.  
  25. error: aborting due to previous error
  26.  
  27. For more information about this error, try `rustc --explain E0405`.
  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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