[r6rs-discuss] [Formal] Add a multi-file library example

[William D Clinger]

For a multi-file example using libraries, see the
current reference implementation of (r6rs unicode)
at

http://ja.soegaard.net/planet/html/r6rs/r6rs/1/0/unicode-library/unicode.sch
http://ja.soegaard.net/planet/html/r6rs/r6rs/1/0/unicode-library/unicode1.sch
http://ja.soegaard.net/planet/html/r6rs/r6rs/1/0/unicode-library/unicode2.sch

That code contains at least one relevant bug: it is illegal
for unicode1.sch define char=?, char<?, char>?, char<=?,
and char>=?, since those identifiers are imported from
(r6rs base).  (The code was tested by faking the library
form with a quick-and-dirty R5RS macro, which did not check
for such errors.  Sorry.)

Will