bumpish 0.1.0

A set of collections using bump allocations
Documentation 
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use crate::map::entry::OccupiedEntry;
use core::fmt::{self, Debug};

pub struct OccupiedError<'a, K: 'a, V: 'a> {
    pub entry: OccupiedEntry<'a, K, V>,
    pub value: V,
}

impl<K: Debug, V: Debug> Debug for OccupiedError<'_, K, V> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("OccupiedError")
            .field("key", self.entry.key())
            .field("old_value", self.entry.get())
            .field("new_value", &self.value)
            .finish_non_exhaustive()
    }
}

impl<'a, K: Debug, V: Debug> fmt::Display for OccupiedError<'a, K, V> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(
            f,
            "failed to insert {:?}, key {:?} already exists with value {:?}",
            self.value,
            self.entry.key(),
            self.entry.get(),
        )
    }
}