File: assoc_const_generic_impl.rs

package info (click to toggle)
rustc 1.86.0%2Bdfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, forky, sid
  • size: 913,560 kB
  • sloc: xml: 158,127; python: 35,921; javascript: 19,689; sh: 19,600; cpp: 18,906; ansic: 13,124; asm: 4,376; makefile: 708; perl: 29; lisp: 29; ruby: 19; sql: 11
file content (19 lines) | stat: -rw-r--r-- 475 bytes parent folder | download | duplicates (11) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
//@ build-fail

trait ZeroSized: Sized {
    const I_AM_ZERO_SIZED: ();
    fn requires_zero_size(self);
}

impl<T: Sized> ZeroSized for T {
    const I_AM_ZERO_SIZED: ()  = [()][std::mem::size_of::<Self>()]; //~ ERROR evaluation of `<u32 as ZeroSized>::I_AM_ZERO_SIZED` failed
    fn requires_zero_size(self) {
        Self::I_AM_ZERO_SIZED;
        println!("requires_zero_size called");
    }
}

fn main() {
    ().requires_zero_size();
    42_u32.requires_zero_size();
}