{"ast_node_type":"function","tokens":[{"end":129,"kind":"keyword","start":0,"text":"fn"}]}
            fn expander(&self) -> fn (&dyn ExpandDatabase, MacroCallId, &tt::TopSubtree, Span) -> ExpandResult<tt::TopSubtree>  {
        impl BuiltinFnLikeExpander {
                match *self {