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  1. #![allow(unreachable_code)]
  2. #![feature(const_fn)]
  3.  
  4. fn main() {
  5.     println!("{:?}", {
  6.          use std::num::NonZeroU32; const fn c(c: char) -> Option<NonZeroU32> { if c == '\0' { None } else { Some(unsafe { NonZeroU32::new_unchecked(c as u32) }) } } c('\0')
  7.     });
  8. }
  9.  
  10.  
  11. /* ~~~~=== stderr ===~~~~
  12.    Compiling playground v0.0.1 (/playground)
  13. error[E0019]: constant function contains unimplemented expression type
  14.  --> src/main.rs:6:83
  15.   |
  16. 6 |          use std::num::NonZeroU32; const fn c(c: char) -> Option<NonZeroU32> { if c == '\0' { None } else { Some(unsafe { NonZeroU32::new_unchecked(c as u32) }) } } c('\0')
  17.   |                                                                                   ^^^^^^^^^
  18.  
  19. error[E0019]: constant function contains unimplemented expression type
  20.  --> src/main.rs:6:80
  21.   |
  22. 6 |          use std::num::NonZeroU32; const fn c(c: char) -> Option<NonZeroU32> { if c == '\0' { None } else { Some(unsafe { NonZeroU32::new_unchecked(c as u32) }) } } c('\0')
  23.   |                                                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  24.  
  25. error: aborting due to 2 previous errors
  26.  
  27. For more information about this error, try `rustc --explain E0019`.
  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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