Backend unexpectedly closed connection

Paul Mamin (magamos(at)mail(dot)ru) reports a bug with a severity of 4
The lower the number the more severe it is.

Short Description
Backend unexpectedly closed connection

Long Description
Sequence:
-------------------------------------------------------------
listen xxx;
create table xx (a int4);
create rule xx_xx2 as on delete to xx where old.a=1 do notify xxx;
-------------------------------------------------------------

Output:
something like "backend closed connection"

Output I expected:
at least some error message, but not closing of connection.
I know that my SQL sequence is wrong, but i just expected the error
message.

PostgreSQL version:
7.1.1

Platform information:
Linux Slackware 7.1, kernel 2.4.1

Sample Code
listen xxx;
create table xx (a int4);
create rule xx_xx2 as on delete to xx where old.a=1 do notify xxx;

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