SFROTZ: double free or corruption (!prev) after saving then quitting by typing QUIT
Start a game, type SAVE, then type QUIT. sfrotz will abort like this:
$ ./sfrotz zork1.z3
double free or corruption (!prev)
Aborted
b732a93a6244ddd92a9b9a3e3a46c687 zork1.z3
Edited by David Griffith