{"ast_node_type":"variable","tokens":[{"end":93,"kind":"keyword","start":0,"text":"let"}]}
                let decl = self.lower_delegation_decl(sig_id, param_count, c_variadic, span);
                let (param_count, c_variadic) = self.param_count(sig_id);
                let sig = self.lower_delegation_sig(sig_id, decl, span);