// MIR for `ub_if_b` after PreCodegen

fn ub_if_b(_1: Thing) -> Thing {
    debug t => _1;
    let mut _0: Thing;
    let mut _2: isize;
    let mut _3: bool;
    scope 1 (inlined unreachable_unchecked) {
        scope 2 {
            scope 3 (inlined unreachable_unchecked::runtime) {
            }
        }
    }

    bb0: {
        _2 = discriminant(_1);
        _3 = Eq(_2, const 0_isize);
        assume(move _3);
        _0 = move _1;
        return;
    }
}