rust/tests/ui/const-generics/invalid-enum.rs

#![feature(adt_const_params)]
#![allow(incomplete_features)]

#[derive(PartialEq, Eq)]
enum CompileFlag {
    A,
    B,
}

pub fn test_1<const CF: CompileFlag>() {}
pub fn test_2<T, const CF: CompileFlag>(x: T) {}
pub struct Example<const CF: CompileFlag, T=u32>{
    x: T,
}

impl<const CF: CompileFlag, T> Example<CF, T> {
  const ASSOC_FLAG: CompileFlag = CompileFlag::A;
}

pub fn main() {
  test_1::<CompileFlag::A>();
  //~^ ERROR: expected type, found variant
  //~| ERROR: unresolved item provided when a constant was expected

  test_2::<_, CompileFlag::A>(0);
  //~^ ERROR: expected type, found variant
  //~| ERROR: unresolved item provided when a constant was expected

  let _: Example<CompileFlag::A, _> = Example { x: 0 };
  //~^ ERROR: expected type, found variant
  //~| ERROR: unresolved item provided when a constant was expected

  let _: Example<Example::ASSOC_FLAG, _> = Example { x: 0 };
  //~^ ERROR: type provided when a constant was expected
}