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Re: Issue: EXTENSIONS-POSITION (version 1)

CLtL p. 351 indicates that more # read macros could be added to the
standard language, but doesn't really address the issue of whether
implementations can provide their own # read macros.  It does list a
set that are explicitly reserved for users, though.

I know of at least one implementation (Lucid) that has added a #P
syntax for pathnames -- see the requirement on p. 370 that pathnames
PRINT in such a way that they can be READ in again.