derive_more 2.1.1

Adds #[derive(x)] macros for more traits
Documentation 
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use core::{error::Error, fmt};

/// Error of parsing an enum value its string representation.
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
pub struct FromStrError {
    type_name: &'static str,
}

impl FromStrError {
    #[doc(hidden)]
    #[must_use]
    #[inline]
    pub const fn new(type_name: &'static str) -> Self {
        Self { type_name }
    }
}

impl fmt::Display for FromStrError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "Invalid `{}` string representation", self.type_name)
    }
}

impl Error for FromStrError {}