Re: [PATCH] Ghost specifiers
Ben Wing writes:
[...] For that matter, there would be no need to call copy-tree
at all if it were possible to mark conses and vectors (and
strings) as read-only. This should be possible using minimal
tag bits, and I think it would be a great feature to add as it
would eliminate a lot of other places where lists are copied
solely to avoid possible malicious code modifying them. Kyle?
I have no idea what this is all about, but it is possible. With
USE_INDEXED_LRECORD_IMPLEMENTATION, there is room in the lrecord
header for property bits. Checks for the read-only bit would be
in the same places that CHECK_IMPURE is used now.