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- #![allow(unreachable_code)]
- #![feature(const_fn)]
- fn main() {
- println!("{:?}", {
- 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')
- });
- }
- /* ~~~~=== stderr ===~~~~
- Compiling playground v0.0.1 (/playground)
- error[E0554]: #![feature] may not be used on the stable release channel
- --> src/main.rs:2:1
- |
- 2 | #![feature(const_fn)]
- | ^^^^^^^^^^^^^^^^^^^^^
- error: aborting due to previous error
- For more information about this error, try `rustc --explain E0554`.
- error: Could not compile `playground`.
- To learn more, run the command again with --verbose.
- */
- /* ~~~~=== stdout ===~~~~
- */
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