tip: how to not forget attachments

[Antoine Beaupré]

On 2018-03-19 15:57:05, Brian Sniffen wrote:
> `error` doesn’t do any unwinding; it leaves the program state wherever it was for analysis.  You probably want throw/catch, as described at https://www.gnu.org/software/emacs/manual/html_node/elisp/Catch-and-Throw.html#Catch-and-Throw

Wait, but what tag would I throw? message-send doesn't do any catching
around the hook calls...

a.

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badly written and randomly enforced.
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