calculation 0.1.0

A simple mathematical expression calculator written in Rust, supporting arithmetic operations, functions, and interactive REPL.
Documentation 
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use std::{
    fmt::{Debug, Display},
    io, num,
};

use rustyline::error::ReadlineError;

pub type Result<T> = std::result::Result<T, Error>;

#[derive(Clone, PartialEq)]
pub enum Error {
    IO(String),
    Parse(String),
}

impl Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Error::IO(s) | Error::Parse(s) => write!(f, "{}", s),
        }
    }
}

impl Debug for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self)
    }
}

impl From<io::Error> for Error {
    fn from(value: io::Error) -> Self {
        Error::IO(value.to_string())
    }
}

impl From<num::ParseFloatError> for Error {
    fn from(value: num::ParseFloatError) -> Self {
        Error::Parse(value.to_string())
    }
}

impl From<ReadlineError> for Error {
    fn from(err: ReadlineError) -> Self {
        Error::IO(err.to_string())
    }
}