src/test/ui/rfc-2632-const-trait-impl/default-method-body-is-const-same-trait-ck.rs

#![feature(const_trait_impl)]

#[const_trait]
pub trait Tr {
    fn a(&self) {}

    fn b(&self) {
        ().a()
        //~^ ERROR the trait bound
    }
}

impl Tr for () {}

fn main() {}