1 error[E0632]: cannot provide explicit generic arguments when `impl Trait` is used in argument position
2 --> $DIR/impl-trait-with-const-arguments.rs:18:20
4 LL | assert_eq!(f::<4usize>(Usizable), 20usize);
5 | ^^^^^^ explicit generic argument not allowed
7 error: aborting due to previous error
9 For more information about this error, try `rustc --explain E0632`.