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3.5 Debugger troubleshooting

Code which modifies the readtable case of the readtable can hinder debugger interaction. This is because standard commands entered as lowercase :a for example will not be recognized if the readtable case is :preserve or :downcase.

You can use with-debugger-wrapper together with with-standard-io-syntax to enable the debugger to recognize such input if the code in body should enter the debugger, like this:

(defun my-debugger-wrapper (func condition)
  (with-standard-io-syntax
    (funcall func condition)))
 
(dbg:with-debugger-wrapper
    'my-debugger-wrapper
  (let ((*readtable* (some-modified-readtable)))
    body
))

LispWorks User Guide and Reference Manual - 20 Sep 2017

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