pub struct PanicError;
use std::fmt;
impl<E> From<E> for PanicError
where
    E: fmt::Debug,
{
    fn from(e: E) -> Self {
        panic!("{:?}", e)
    }
}

pub fn unwrap<T>(r: Result<T, PanicError>) -> T {
    if let Ok(t) = r {
        t
    } else {
        unreachable!();
    }
}