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they are out of scope for any code after that anyway, leaving isnull true should be harmless. However, PL/pgSQL Debugger doesn't seem to care about the scoping and crashed, per report by Robert Walker (bug #4635). And it's good to be tidy for debugging purposes too. Fix in 8.3, 8.2 and 8.1 branches, CVS HEAD was fixed earlier already. Analysis and fix by Ashesh Vashi and Dave Page.