{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"///"}]}
    /// or attributes on the type itself when input is an enum.
    /// tokens from `f` wrapped in an `match` expression. Emits errors for use of derive on unions
    pub(crate) fn each_variant<'s, F>(self, structure: &mut Structure<'s>, f: F) -> TokenStream