FUNCTION problem

Hello,

I am having a problem with a FUNCTION.
The function creates just fine with no errors.

However, when I call the function postgres produces an error.

Perhaps someone can enlighten me.

--I can reproduce the error by making a test function
--that is much easier to follow that the original:

CREATE OR REPLACE FUNCTION test_function(integer)
RETURNS SETOF RECORD AS
$BODY$
DECLARE croid integer;
BEGIN

--PERFORM A SMALL CALCULATION
--DOESNT SEEM TO MATTER WHAT IT IS

SELECT INTO croid 2;

--A SELECT STATEMENT OUTPUTS RECORDS (one in this case)
SELECT croid,$1;
END;

$BODY$
LANGUAGE 'plpgsql' VOLATILE

--The call looks like the following:

SELECT test_function(1);

--The resulting error reads as follows:

ERROR: query has no destination for result data
HINT: If you want to discard the results of a SELECT, use PERFORM instead.
CONTEXT: PL/pgSQL function "test_function" line 5 at SQL statement

********** Error **********

ERROR: query has no destination for result data
SQL state: 42601
Hint: If you want to discard the results of a SELECT, use PERFORM instead.
Context: PL/pgSQL function "test_function" line 5 at SQL statement