Bugfix: out-of-range negative indices into lists.

We have a problem not handling negative list indices
which index beyond the beginning of the list.
Such accesses are just storing and retrieving the
first element!

* lib.c (listref): If a negative index is still negative
after the length of the list is added to it, then
return nil. Do not return car(list)!
(listref_l): Similary, do not return car_l(list) if
the index is less than zero, so that an error
occurs for an out-of-range negative index.

* txr.1: Update the documentation for ref
to describe these indexing constraints, and also
to include hashes.

0 files changed, 0 insertions, 0 deletions