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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.devel
Subject: Re: Debugging errors in bytecomp code?
Date: Tue, 31 Jan 2017 09:32:28 -0500
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> Is there a way to enter the debugger when a error in bytecomp code
> itself is encountered? Right now, all errors including compilation ones
> are printed to the *Compile-Log* buffer, making it impossible to get
> a backtrace for internal compiler errors.

(setq byte-compiler-debug t) ?


        Stefan