{"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"if"}]}
        if tuple_arguments == TupleArguments
        // TupleArguments is set only when this is an implicit call (my_closure(...)) rather than explicit (my_closure.call(...))
            && let Some(assoc_item) = self.tcx.opt_associated_item(def_id)