src/test/ui/rfc-2632-const-trait-impl/generic-bound.rs

   1 // run-pass
   2
   3 #![feature(const_trait_impl)]
   4 #![feature(const_fn_trait_bound)]
   5
   6 use std::marker::PhantomData;
   7
   8 struct S<T>(PhantomData<T>);
   9
  10 impl<T> Copy for S<T> {}
  11 impl<T> Clone for S<T> {
  12     fn clone(&self) -> Self {
  13         S(PhantomData)
  14     }
  15 }
  16
  17 impl<T> const std::ops::Add for S<T> {
  18     type Output = Self;
  19
  20     fn add(self, _: Self) -> Self {
  21         S(std::marker::PhantomData)
  22     }
  23 }
  24
  25 const fn twice<T: std::ops::Add>(arg: S<T>) -> S<T> {
  26     arg + arg
  27 }
  28
  29 fn main() {
  30     let _ = twice(S(PhantomData::<i32>));
  31 }