Subject: bug#33294: xwidget-insert crashes Emacs

From: Stefan Monnier <[email-masked]>
Date: Fri, 09 Nov 2018 21:23:03 -0500

>> The "impossible" category is for when such objects can never be passed
>> to `type-of`, typically because they are not available to Elisp.
>>
>> But there's no harm/risk to "allow" a particular kind of object even if
>> it's actually impossible for it to be passed to type-of.
> Pardon my ignorance, but why then is the fallback behaviour on getting
> an "impossible" type to abort Emacs, rather than eg just throwing an
> error or returning 'unknown or somesuch?

Presumably it indicates a bug in the C code of Emacs, hence "abort".
But either way works for me,

        Stefan