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On rereading SRFI 10, I see that it only prescribes the syntax #,(<tag> <datum>*). It explicitly says that the define-reader-ctor procedure is merely a suggestion and not part of the SRFI. However, your qualifier "when all the expressions are literal" in the "Readtable literals" section is always true in SRFI 10 syntax. Therefore, I would consider subsuming SRFI 10 into SRFI 108 by desugaring #,(foo a b "10" 32) as #&foo[&{'a 'b "10" 32}]. Note that symbols and lists must be quoted as well as strings in order to force them to be interpreted as datums. Since this makes define-reader-ctor unnecessary, and it is unscoped and has phasing problems, I would leave it out. To resolve the conflict between SRFI 10's use of #, and its use by syntax-rules, #. could be provided as an alternative to #,. Originally, CL #. meant read-time evaluation and #, meant load-time, but #, was removed in ANSI CL because it was confusing and often badly implemented. Though it is true that SRFI 10 #, is more restrictive than CL #., the difference is not really that large. -- I don't know half of you half as well John Cowan as I should like, and I like less than half cowan@xxxxxxxx of you half as well as you deserve. http://www.ccil.org/~cowan --Bilbo