{"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"self.expr_map.get(&src).copied()"}]}
        self.expr_map.get(&src).copied()
        let src = node.map(AstPtr::new).map(AstPtr::upcast::<ast::MacroExpr>).map(AstPtr::upcast);
    }