This doesn't solve the <0,0> problem but it does prevent mnexto()
from using uninitialized coordinates if enexto() fails. It also adds
several debugging messages.
enexto() was ignoring map row #0 (unlike column #0, row #0 contains
valid map locations). Fixing that doesn't matter for Plane of Water
though since that row is stone there--that's probably a bug. It was
also repeatedly re-testing the top+1 and bottom rows and left and
right columns after they had already failed to be acceptable. It
still does some of that, but less.
projects / nethack / commit