typedef enum CELL_ENUM {
  CELL_LAMBDA, CELL_SFUNC, CELL_VFUNC, CELL_LIST, CELL_ATOM
} CELL_TYPE;


/* Cells are simply the type flag, the car, and the cdr.  */

typedef struct CELL_STRUCT {
  void *car, *cdr;

} CELL;

line 1: '=' expected near 'enum'