tests/ui/const-generics/generic_const_exprs/abstract-const-as-cast-4.rs

   1 // check-pass
   2 #![feature(generic_const_exprs)]
   3 #![allow(incomplete_features)]
   4
   5 trait Trait {}
   6 pub struct EvaluatableU128<const N: u128>;
   7
   8 struct HasCastInTraitImpl<const N: usize, const M: u128>;
   9 impl<const O: usize> Trait for HasCastInTraitImpl<O, { O as u128 }> {}
  10
  11 pub fn use_trait_impl<const N: usize>() where EvaluatableU128<{N as u128}>:, {
  12     fn assert_impl<T: Trait>() {}
  13
  14     assert_impl::<HasCastInTraitImpl<N, { N as u128 }>>();
  15     assert_impl::<HasCastInTraitImpl<N, { N as _ }>>();
  16     assert_impl::<HasCastInTraitImpl<12, { 12 as u128 }>>();
  17     assert_impl::<HasCastInTraitImpl<13, 13>>();
  18 }
  19 pub fn use_trait_impl_2<const N: usize>() where EvaluatableU128<{N as _}>:, {
  20     fn assert_impl<T: Trait>() {}
  21
  22     assert_impl::<HasCastInTraitImpl<N, { N as u128 }>>();
  23     assert_impl::<HasCastInTraitImpl<N, { N as _ }>>();
  24     assert_impl::<HasCastInTraitImpl<12, { 12 as u128 }>>();
  25     assert_impl::<HasCastInTraitImpl<13, 13>>();
  26 }
  27
  28
  29 fn main() {}