Report was for Sokoban but it applied anywhere: if a teleported
boulder landed in a pit or trap door or hole and flooreffects() used
it up (so returned True), rloco() didn't update the location it was
teleported from and it appeared not to have moved. (Line of sight was
updated to reflect its absence but map spot wasn't redrawn without it.)
Changing
if (ammo_and_launcher(otmp, uwep) && mwep->otyp == ELVEN_BOW)
(with 'uwep' typo) to
if (mwep->otyp == ELVEN_BOW && ammo_and_launcher(otmp, mwep))
(with fixed 'mwep') moved ammo_and_launcher()'s hidden non-null
test to after 'mwep->otyp'. If mwep was Null (so monster must be
throwing non-ammo such as darts or daggers rather than shooting
with a launcher), a crash occurred. (Throwing such things while
the monster is wielding any weapon doesn't have this problem.)
I don't think 3.6.2 can crash here. If hero's uwep is a bow, otmp
must be arrows to get past pre-3.6.3's incorrect ammo_and_launcher()
check. And a monster won't shoot arrows unless wielding a bow, so
monster's mwep would be non-Null regardless of what uwep is.
I tested a kobold with darts and an elven bow. But I also gave it
one elven arrow to provoke it into wielding the bow and my test
didn't throw darts with nothing wielded....
A typo caused the bow and arrow check when a monster was wielding an
elven box to test the hero's weapon with monster's ammo. [I looked
at the old slash'em code where I think this came from and it doesn't
have the typo but does have a different bug. A monster could get a
multi-shot volley by wielding an elven bow when throwing darts or
spears. The extra bow and arrow check is intended to prevent that.
The typo was probably by me but I have no memory of that code....]
Elves with bows (or other monsters who manage to pick up and wield an
elven bow) will shoot bigger volleys after this fix. That will make
them more dangerous but also cause them to run out of arrows more
quickly.
From the newsgroup (reported for slash'em but applies to nethack too):
a chaotic monk was crowned and told he or she had been "chosen to
steal souls for My Glory!" while being given a spellbook of restore
ability which has nothing whatever to do with soul stealing. There's
alternate wording for when Stormbringer can't be given because it
already exists; also use that for when it's not going to be given
because the character is discouraged against wielding weapons.
Add the contributed code that checks for attempting to start a
duplicate timer. It's based on a comment which must have been there
at least 25 years and doesn't solve any known problems, but it is
conceptually similar to the large amount of sanity checking which has
gone into 3.6.x.
It didn't work as is because it was comparing two unions with '=='.
I don't know offhand whether C++ supports that but C doesn't (through
C11 at least; don't know about C17). The union ('anything') is simple
enough that two instances can be compared without jumping through hoops.
I've also added another check for timer 'kind' (level, object, monster,
or global).
