// MIR for `old` after PreCodegen

fn old(_1: Result<T, E>) -> Result<T, E> {
    debug x => _1;
    let mut _0: std::result::Result<T, E>;
    let mut _2: isize;
    let _3: T;
    let _4: E;
    scope 1 {
        debug v => _3;
    }
    scope 2 {
        debug e => _4;
    }

    bb0: {
        _2 = discriminant(_1);
        switchInt(move _2) -> [0: bb1, 1: bb2, otherwise: bb4];
    }

    bb1: {
        _3 = move ((_1 as Ok).0: T);
        _0 = Result::<T, E>::Ok(copy _3);
        goto -> bb3;
    }

    bb2: {
        _4 = move ((_1 as Err).0: E);
        _0 = Result::<T, E>::Err(copy _4);
        goto -> bb3;
    }

    bb3: {
        return;
    }

    bb4: {
        unreachable;
    }
}