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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.devel
Subject: Re: Making debugging possible on expressions executed from ielm
Date: Mon, 15 Jan 2018 12:23:58 -0500
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> - if debug-on-error is t, emacs will enter the debugger and show a stack
> trace, just like with almost any other evaluation method. When the user
> continues the execution from the debugger, ielm will correctly resume
> execution

Have you tried to use `condition-case-unless-debug`?


        Stefan