slotmap 1.1.1

Slotmap data structure
Documentation 
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use core::fmt::Debug;

/// Internal stable replacement for !.
#[derive(Debug)]
pub enum Never {}

pub trait UnwrapNever<T> {
    fn unwrap_never(self) -> T;
}

impl<T> UnwrapNever<T> for Result<T, Never> {
    #[inline(always)]
    fn unwrap_never(self) -> T {
        match self {
            Ok(x) => x,
            Err(e) => match e {},
        }
    }
}

/// Returns if a is an older version than b, taking into account wrapping of
/// versions.
pub fn is_older_version(a: u32, b: u32) -> bool {
    let diff = a.wrapping_sub(b);
    diff >= (1 << 31)
}

pub struct PanicOnDrop(pub &'static str);
impl Drop for PanicOnDrop {
    fn drop(&mut self) {
        panic!("{}", self.0);
    }
}