BUG #1655: trapping errors doesn't work

The following bug has been logged online:

Bug reference: 1655
Logged by: Emanuel Brokmann
Email address: brokmann(dot)emanuel(at)ava(dot)de
PostgreSQL version: 8.0
Operating system: Red Hat Linux 3.2.3-42
Description: trapping errors doesn't work
Details:

while executing:

>>BEGIN
>> insert into comlineprintboxen VALUES(109, '', '', '', >>'', '');
>>EXCEPTION
>> WHEN unique_violation then
>> UPDATE comlineprintboxen SET verteiler='', >>panel='', dose='',
switch='', port='' WHERE >>printboxid=109
>>END;

the following error occurs:

>>ERROR: syntax error at or near "UPDATE" at character 8

i compared the command with the one from page 550 ff of the documentation,
but can't find differences.

Would be kind of you to help me

Emanuel Brokmann