[Openmcl-devel] Side effects when redefining dispatching reader macro?

[Mirko Vukovic]

After executing the following code (using named-readtables) reader macros
such as #C(...), #(...), #|...|# don't work.

seems to delete prior reader macros:

CL-USER> (ql:quickload :named-readtables)
CL-USER>
(named-readtables:defreadtable :test
  (:merge :standard)
  (:macro-char #\# :dispatch))
CL-USER> (named-readtables:in-readtable :test)
CL-USER> #C(1d0 1d0)

Error message:
Reader error on #<STRING-INPUT-STREAM  #x21010256CD>, near position 2,
within "#C(1d0 1d0)
":
Undefined character #\C in a #\# dispatch macro.

The same code on SBCL does not remove the prior definitions of the reader
macro.

I don't know if that is a bug in CCL, named-readtables, or freedom allowed
under the standard.

Maybe someone can make sense of it.

Mirko
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