Possible fix for B10001.
When the code went into case 3 in cursed_book(),
the game hung in an endless loop in take_gold().
The call stack was:
take_gold() line 22 + 10 bytes
cursed_book(int 2) line 124
study_book(obj * 0x00968860) line 421 + 19 bytes
doread() line 130 + 9 bytes
rhack(char * 0x005b8eac in_line) line 1813 + 3 bytes
moveloop() line 405 + 7 bytes
main(int 3, char * * 0x00962ac0) line 93
510ae5b5f2