derive shorthand for enum

[Luro02]

enum Example {
    Variant1 {
        field: usize,
    },
    Variant2 {
        field: usize,
    },
}

impl Example {
    pub fn set_field(&mut self, value: usize) -> &mut Self {
        match &mut self {
            Self::Variant1 { field } | Self::Variant2 { field } => {
                field = value;
            }
        }
        self
    }
}