Re: pg_upgrade 9.4 -> 9.5 with pg_trgm fails for me

On Fri, Jan 08, 2016 at 04:03:51PM -0500, Tom Lane wrote:

> BTW, the one-liner fix that I'd had in mind when I wrote that does indeed
> fix this particular problem, but after studying the code I realized that
> there's a whole bunch of related problems; for instance I believe
> pg_upgrade would lose domain constraints on a domain type that's in an
> extension installed into pg_catalog :-(.

Does this warrant adding a few words to the documentation
warning against installing extensions into pg_catalog. ?

Karsten
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