rair-env 0.1.0

Associative list implementation with heterogeneous value in the (K, V) pair
Documentation 
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/*
 * err.rs: error handling for renv.
 * Copyright (C) 2019  Oddcoder
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
use std::fmt;

#[derive(Debug, PartialEq)]
pub enum EnvErr {
    NotFound,
    DifferentType,
    CbFailed,
    AlreadyExist,
}

impl fmt::Display for EnvErr {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            EnvErr::NotFound => write!(f, "Environment variable not found."),
            EnvErr::DifferentType => write!(f, "Environment variable has different type."),
            EnvErr::CbFailed => write!(f, "Call back failed."),
            EnvErr::AlreadyExist => write!(f, "Environment variable already exist."),
        }
    }
}