keil环境下,报错#70:incomplete type is not allowed,报错在struct psock

keil环境下,报错#70:incomplete type is not allowed,报错在struct psock sin,sout;

struct psock{
struct pt pt, psockpt; /* Protothreads - one that's using the psock
functions, and one that runs inside the
psock functions. */
const u8_t *sendptr; /* Pointer to the next data to be sent. */
u8_t *readptr; /* Pointer to the next data to be read. */
char *bufptr; /* Pointer to the buffer used for buffering
incoming data. */
u16_t sendlen; /* The number of bytes left to be sent. */
u16_t readlen; /* The number of bytes left to be read. */
struct psock_buf buf; /* The structure holding the state of the
input buffer. */
unsigned int bufsize; /* The size of the input buffer. */
unsigned char state; /* The state of the protosocket. */
};




已经定义了psock啊,怎么老是提示有错啊,难道要typedef,但是pt也是个结构体却没有typedef啊,我就觉得奇怪了,被这个问题困扰很久了