OK, developer's FAQ updated to mention errfinish,
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Tom Lane wrote:
> Martijn van Oosterhout <kleptog@svana.org> writes:
> > Hmm, depends. It's not asked often, that for sure. Yet everytime it
> > comes up I keep forgetting if I should be breaking on errstart, errmsg
> > or something else. One of these days I might just write it on a post-it
> > note next to my computer.
>
> I always break on errfinish myself. At one time elog didn't go through
> errstart (it may still not, I forget) so errfinish was the only
> certainly common point for catching both elog and ereport. Another
> advantage is that by that point, all the error info is set up and you
> can inspect it if you want to.
>
> > - Note that DEBUG level message will trigger
> > - also so you might need to "cont" a few times to get the error you
> > - want.
>
> Also, control doesn't come to errfinish at all unless the message is
> going to be printed, so the DEBUG-message problem goes away.
>
> regards, tom lane
>
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