{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"//"}]}
            // We found `ref mut? ident:`, try to parse a `name,` or `name }`.
            && self.token == token::Colon
            && let Some(name_span) = self.look_ahead(1, |t| t.is_ident().then(|| t.span))