src/test/ui/consts/const-eval/issue-44578.rs

   1 // build-fail
   2
   3 trait Foo {
   4     const AMT: usize;
   5 }
   6
   7 enum Bar<A, B> {
   8     First(A),
   9     Second(B),
  10 }
  11
  12 impl<A: Foo, B: Foo> Foo for Bar<A, B> {
  13     const AMT: usize = [A::AMT][(A::AMT > B::AMT) as usize]; //~ERROR evaluation of `<Bar<u16, u8> as Foo>::AMT` failed
  14 }
  15
  16 impl Foo for u8 {
  17     const AMT: usize = 1;
  18 }
  19
  20 impl Foo for u16 {
  21     const AMT: usize = 2;
  22 }
  23
  24 fn main() {
  25     println!("{}", <Bar<u16, u8> as Foo>::AMT);
  26     //~^ constant
  27 }