This is a bug report. I'm using puri as an example, but it's not a puri

bug.

With the latest version of asdf (3.3.0) puri no longer compiles. The

following compiler error is thrown:

   SET-DISPATCH-MACRO-CHARACTER would modify the standard readtable.

   [Condition of type ASDF/FIND-SYSTEM:LOAD-SYSTEM-DEFINITION-ERROR]

In:

  0: (SET-DISPATCH-MACRO-CHARACTER #\# #\u #<FUNCTION PURI::SHARP-U> #<READTABLE {100002D6C3}>)

The code:

(defun sharp-u (stream chr arg)

  (declare (ignore chr arg))

  (let ((arg (read stream nil nil t)))

    (if *read-suppress*

        nil

      (if* (stringp arg) 

         then (parse-uri arg)

         else

         (internal-reader-error

          stream

          "#u takes a string or list argument: ~s" arg)))))

(set-dispatch-macro-character #\# #\u #'puri::sharp-u)

What puri is doing re: SET-DISPATCH-MACRO-CHARACTER is totally by the

book. Why is this suddenly an error? Is there a workaround?

Backing up to the next most recent release of asdf makes the problem go

away:

dev-lisp/asdf-3.2.1-r1:0/3.2.1-r1

dev-lisp/uiop-3.2.1:0

I tried to find the asdf changelog to see if this is a documented

change. But the link is broken.

uiop seems to be closely tied to asdf. Not sure which package is

actually at fault.

--

Carlos Konstanski