hash: fix broken copy_hash.

Impact assessment: this bug affects the correctness of
all programs which rely on copying hash tables. Direct
reliance means the use of copy-hash, or using the generic copy
function on hash objects.  Indirect reliance occurs through
hash-diff which uses copy-hash.  Nothing in TXR itself calls
hash-diff.  The the listener's Tab completion relies on
copy-hash for package-sensitive symbol visibility calculation.
Since that is an interactive feature, the impact is low.

* hash.c (copy_hash_chain): New static function.
(copy_hash): Use copy_hash_chain instead of copy_alist,
since the pairs are hash conses and not regular conses:
they have a hash value field that must be copied.

0 files changed, 0 insertions, 0 deletions