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tail-recursive string-any string-every

This page is part of the web mail archives of SRFI 13 from before July 7th, 2015. The new archives for SRFI 13 contain all messages, not just those from before July 7th, 2015.

The functions string-any and string-every are defined such that the
last predicate application on the final element is a tail call.  Is
there any point to this?  I.e. can we realiztically imagine an
application that will really benefit?  I can imagine applications
being *hurt* by this requirement:
(1) This precludes string-any string-every being implemented in a
low-level language that does not support tail calls, such as C.
(2) If a Scheme implementation provides two modes:  One that is
support proper tail calls and one that doesn't (because that is faster),
it requires compiling string-any string-every using the slower
compilation mode.

Could we remove this requirement?  (I know it is late ...)
	--Per Bothner
per@xxxxxxxxxxx   http://www.bothner.com/~per/