Dropping into a guile shell on error

I’m trying to merge the git master into the guile 3 branch but I’m getting a weird error with undefined variables. Is it possible to drop into a guile shell when the error occurs instead of crashing? I’d like to examine the variables at the time of the crash maybe step through the source?

In init-texmacs.scm there are some indication that might be possible, in particular


(define developer-mode?
  (equal? (cpp-get-preference "developer tool" "off") "on"))

(if developer-mode?
    (debug-enable 'backtrace 'debug))

Try to activate the developer tools in the menus and then exit and reenter TeXmacs to rerun the initialisation script.

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