This is a summary of the replies I received to my enquiries
about "erasure by reference-counting".
Apparently reference-counting is alive and kicking in Smalltalk-80's
garbage collector. It has also been used in Xerox's Interlisp. A
source of references is "The Implementation of Functional Programming
Languages" by Simon L. Peyton Jones.
Thanks are due to the following: Ray Fink, Robert Strandh, Mike Gigante,
Peter Norvig, dmfloy, Keiji Kanazawa and kythera.
Regards,
Bill Birch
--
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