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#![feature(const_trait_impl)]

#[const_trait]
pub trait Plus {
    fn plus(self, rhs: Self) -> Self;
}

impl const Plus for i32 {
    fn plus(self, rhs: Self) -> Self {
        self + rhs
    }
}

impl Plus for u32 {
    fn plus(self, rhs: Self) -> Self {
        self + rhs
    }
}

pub const fn add_i32(a: i32, b: i32) -> i32 {
    a.plus(b) // ok
}

pub const fn add_u32(a: u32, b: u32) -> u32 {
    a.plus(b)
    //~^ ERROR the trait bound
}

fn main() {}