[chap 9] invalid struct definition using clang about buildyourownlisp HOT 2 CLOSED

typedef struct lval {
  int type;
  long num;
  /* Error and Symbol types have some string data */
  char* err;
  char* sym;
  /* Count and Pointer to a list of "lval*" */
  int count;
  struct lval** cell;
} lval;

typedef struct {
  int type;
  long num;
  /* Error and Symbol types have some string data */
  char* err;
  char* sym;
  /* Count and Pointer to a list of "lval*" */
  int count;
  struct lval** cell;
} lval;