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bug#33294: xwidget-insert crashes Emacs

From: Glenn Morris
Subject: bug#33294: xwidget-insert crashes Emacs
Date: Fri, 09 Nov 2018 13:09:12 -0500
User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)

Stefan Monnier wrote:

> 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?

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