{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
                let (param_count, c_variadic) = self.param_count(sig_id);
                let is_method = self.is_method(sig_id, span);
                let decl = self.lower_delegation_decl(sig_id, param_count, c_variadic, span);