{"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"bx.tail_call(fn_ty,"}]}
            bx.tail_call(fn_ty, fn_attrs, fn_abi, fn_ptr, llargs, self.funclet(fx), instance);
        if kind == CallKind::Tail {
            return MergingSucc::False;