[Xsb-development] Small bug fix

[Terrance S. <ts...@cs...>]

All:

I just fixed a bug that showed up as a core dump in a Flora
program.  The bug had to do with the variable num_heap_term_vars
not being initialized when it went through the "ground" path of
table_consume_answer() in tabletry.  The lack of initialization
meant that a value was inappropriately copied to a delay list;
then the core dump arose when an answer using the delay
list (including the bad value) was copied into table space.  The
inappropriate copy of the value occurred on about the 35
millionth SLGWAM instruction of the query, and the core dump on
about the 50 millionth.  The fix was one line, but it took me
about 20 hours of debugging to figure out what went wrong.

I hope you'll all forgive me my self-congratulation.  Its nice,
though, that the bugs are getting more and more obscure lately.

Terry