void *pData;
  char *zKey;
  int nKey;
  Th_HashEntry *pNext;     /* Internal use only */
};
Th_Hash *Th_HashNew(Th_Interp *);
void Th_HashDelete(Th_Interp *, Th_Hash *);
void Th_HashIterate(Th_Interp*,Th_Hash*,void (*x)(Th_HashEntry*, void*),void*);
void Th_HashIterate(Th_Interp*,Th_Hash*,int (*x)(Th_HashEntry*, void*),void*);
Th_HashEntry *Th_HashFind(Th_Interp*, Th_Hash*, const char*, int, int);

/*
** Useful functions from th_lang.c.
*/
int Th_WrongNumArgs(Th_Interp *interp, const char *zMsg);