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DECLARE section needs to know about it. Formerly, everyplace besides DECLARE that created variables needed to do "plpgsql_add_initdatums(NULL)" to prevent those variables from being sucked up as part of a subsequent DECLARE block. This is obviously error-prone, and in fact the SQLSTATE/SQLERRM patch had failed to do it for those two variables, leading to the bug recently exhibited by Asif Ali Rehman: a DECLARE within an exception handler tried to reinitialize SQLERRM. Although the SQLSTATE/SQLERRM patch isn't in any pre-8.1 branches, and so I can't point to a demonstrable failure there, it seems wise to back-patch this into the older branches anyway, just to keep the logic similar to HEAD.