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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.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. The JDBC, ODBC, C++, Python, and Tcl interfaces have been moved to the PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate maintenance. A Perl DBI/DBD driver is available from CPAN. See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.