fn default_enum_variant()

in avro_derive/src/lib.rs [285:308]

• 24 lines of code
• 3 McCabe index (conditional complexity)

fn default_enum_variant(
    data_enum: &syn::DataEnum,
    error_span: Span,
) -> Result<Option<String>, Vec<syn::Error>> {
    match data_enum
        .variants
        .iter()
        .filter(|v| v.attrs.iter().any(is_default_attr))
        .collect::<Vec<_>>()
    {
        variants if variants.is_empty() => Ok(None),
        single if single.len() == 1 => Ok(Some(single[0].ident.to_string())),
        multiple => Err(vec![syn::Error::new(
            error_span,
            format!(
                "Multiple defaults defined: {:?}",
                multiple
                    .iter()
                    .map(|v| v.ident.to_string())
                    .collect::<Vec<String>>()
            ),
        )]),
    }
}