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(parent: 0fd38e1) | patch

Improve error messages for malformed array input strings.

Improve error messages for malformed array input strings.

Make the error messages issued by array_in() uniformly follow the style
ERROR: malformed array literal: "actual input string"
DETAIL: specific complaint here
and rewrite many of the specific complaints to be clearer.

The immediate motivation for doing this is a complaint from Josh Berkus
that json_to_record() produced an unintelligible error message when
dealing with an array item, because it tries to feed the JSON-format
array value to array_in(). Really it ought to be smart enough to
perform JSON-to-Postgres array conversion, but that's a future feature
not a bug fix. In the meantime, this change is something we agreed
we could back-patch into 9.4, and it should help de-confuse things a bit.

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