src/test/ui/const-generics/impl-trait-with-const-arguments.rs

   1 trait Usizer {
   2     fn m(self) -> usize;
   3 }
   4
   5 fn f<const N: usize>(u: impl Usizer) -> usize {
   6     N + u.m()
   7 }
   8
   9 struct Usizable;
  10
  11 impl Usizer for Usizable {
  12     fn m(self) -> usize {
  13         16
  14     }
  15 }
  16
  17 fn main() {
  18     assert_eq!(f::<4usize>(Usizable), 20usize);
  19 //~^ ERROR cannot provide explicit generic arguments when `impl Trait` is used in argument position
  20 }