Function render_enum_fields

fn render_enum_fields(
    w: &mut Buffer,
    cx: &Context<'_>,
    g: Option<&Generics>,
    variants: &IndexVec<VariantIdx, Item>,
    count_variants: usize,
    has_stripped_entries: bool,
    is_non_exhaustive: bool,
    enum_def_id: DefId,
)