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It was reported in ​http://clozure.com/pipermail/openmcl-devel/2008-July/008420.html that a saved CurrencyConverter application (presumably built from the trunk as of roughly the date of that message) references a DEAD-MACPTR during "early application initialization".

The current 1.2 version doesn't seem to be affected by this.

There is no reason for the hash table iterator to copy keys and values for lock-free hash tables. (The only reason it does now is that it's a bit hard to change the protocol so that it can stack-cons the key vector for some tables and not others).

with-readtable-iterator is a macro proposed as a de-facto standard extension to Common Lisp by Tobias Rittweiler. It is currently implemented in the with-readtable-iterator branch of Git repository git://repo.or.cz/sbcl/tcr.git (​gitweb).

The macro allows efficient iteration over the reader macros provided in a particular readtable, more than can be provided with ANSI-standard functionality, especially given very large values of char-code-limit. Tobias's named-readtable (​Darcs) for SBCL and Clozure CL, which implements Allegro-like named readtables, uses with-readtable-iterator to merge macros provided by multiple readtables into a single readtable.

Attached is a patch made against r10880 that implements this macro and exports it from CCL. The `with-readtable-iterator' macro body itself is borrowed from Tobias's SBCL implementation.