rust/tests/ui/traits/const-traits/const-impl-requires-const-trait.rs

//@ compile-flags: -Znext-solver
#![feature(const_trait_impl, effects)]
#![allow(incomplete_features)]

pub trait A {}

impl const A for () {}
//~^ ERROR: const `impl` for trait `A` which is not marked with `#[const_trait]`

fn main() {}