How to see stacktrace from \ef preview

[eyeris]

When I use \ef in a certain file, the preview window shows a bunch of
successful defs, followed by an exception:

#<CompilerException java.lang.NullPointerException (gui.clj:0)>

:messages doesn't show anything. How can I see the stacktrace for this
exception?

[Meikel Brandmeyer]

Hi,

Unfortunately this is not possible at the moment. Please open a ticket
on bitbucket.

Sincerely
Meikel