{"ast_node_type":"other","tokens":[{"end":9,"kind":"keyword","start":0,"text":"where"}]}
    where
    fn create_fields<F>(&self, struct_def: &'a VariantData, mk_exprs: F) -> Vec<FieldInfo>
        F: Fn(usize, &ast::FieldDef, Span) -> Vec<P<ast::Expr>>,