tests/ui/traits/const-traits/call-const-trait-method-fail.rs

//@ compile-flags: -Znext-solver
#![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 `u32: [const] Plus`
}

fn main() {}