On Wed, Feb 20, 2013 at 11:18 PM, Faré <fahree@gmail.com> wrote:

Implementations that make the standard readtable read-only:
allegro sbcl
Implementations that don't:
abcl ccl clisp cmucl ecl lispworks scl

This is not true

> (with-standard-io-syntax

(set-dispatch-macro-character #\! #\Y (constantly nil)))

Condition of type: SIMPLE-ERROR

Change readtable

Available restarts:

1. (RESTART-TOPLEVEL) Go back to Top-Level REPL.

Broken at SI:BYTECODES. [Evaluation of: (WITH-STANDARD-IO-SYNTAX (SET-DISPATCH-MACRO-CHARACTER #\! ...))] In: #<process TOP-LEVEL>.

I just realized the error message is broken, but ECL does have read-only readtables and a function to lock them (ext:readtable-lock readtable &optional yes-or-no)

I am not sure about the pprint dispatch table, though. We just recycled old SBCL/CMUCL code for that.

Juanjo

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