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Oct 22nd, 2018
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  1. #![allow(unreachable_code)]
  2.  
  3.  
  4. fn main() {
  5. println!("{:?}", {
  6. std::mem::size_of::<Option<!>>()
  7. });
  8. }
  9.  
  10.  
  11. /* ~~~~=== stderr ===~~~~
  12. Compiling playground v0.0.1 (file:///playground)
  13. error[E0658]: The `!` type is experimental (see issue #35121)
  14. --> src/main.rs:6:36
  15. |
  16. 6 | std::mem::size_of::<Option<!>>()
  17. | ^
  18.  
  19. error: aborting due to previous error
  20.  
  21. For more information about this error, try `rustc --explain E0658`.
  22. error: Could not compile `playground`.
  23.  
  24. To learn more, run the command again with --verbose.
  25.  
  26. */
  27.  
  28. /* ~~~~=== stdout ===~~~~
  29.  
  30. */
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