fetch cursor into id, set_values .... -> problem

Hello,
I get this error
#error 1
ERROR: syntax error at or near "," at character 525
LINE 15: FETCH curs INTO id, set_values;
^
from this function

drop function sx(varchar) ;
CREATE OR REPLACE FUNCTION sx( varchar ) RETURNS varchar AS $$
DECLARE
str_in ALIAS FOR $1;
id RECORD ;
set_values RECORD ;
curs CURSOR FOR SELECT id, set_values FROM constraint_table;
BEGIN
OPEN curs;
FETCH curs INTO id, set_values;
IF (str_in = set_values ) THEN RETURN 1::bit(2);
ELSE RETURN 0::bit(2);
END IF;
END;
$$ LANGUAGE plpgsql;

isn't it correct to declare as type RECORD ?

thanks,
joseph.

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