src/test/ui/rfc-2632-const-trait-impl/trait-where-clause-run.rs

   1 // run-pass
   2
   3 #![feature(const_trait_impl)]
   4
   5 trait Bar {
   6     fn bar() -> u8;
   7 }
   8
   9 #[const_trait]
  10 trait Foo {
  11     fn foo() -> u8 where Self: ~const Bar {
  12         <Self as Bar>::bar() * 6
  13     }
  14 }
  15
  16 struct NonConst;
  17 struct Const;
  18
  19 impl Bar for NonConst {
  20     fn bar() -> u8 {
  21         3
  22     }
  23 }
  24
  25 impl Foo for NonConst {}
  26
  27 impl const Bar for Const {
  28     fn bar() -> u8 {
  29         4
  30     }
  31 }
  32
  33 impl const Foo for Const {}
  34
  35 fn main() {
  36     const ANS1: u8 = Const::foo();
  37     let ans2 = NonConst::foo();
  38
  39     assert_eq!(ANS1 + ans2, 42);
  40 }