Failure to Call a Nested Function

Hi,

I'm trying to create a simple trigger and use a bit of refactoring to
modularize a common section of functionality into another function. In
process, I have created two functions, caller (invoked by the trigger) and
callee (invoked by the caller which it [callee] returns void). However, I'm
getting an error message that is not very descriptive. Here's my code:


CREATE TABLE Person (
 -- other attributes
 date_of_birth  DATE NOT NULL;
);

CREATE OR REPLACE FUNCTION check_year(IN _year INTEGER)
  RETURNS void AS $$
  DECLARE
    current_year INTEGER;
  BEGIN
    current_year := (SELECT EXTRACT(year from now()));

    IF _year > current_year THEN
      RAISE EXCEPTION 'Year cannot be in the future date: %', current_year;
    END IF;

    RETURN;
  END;
$$ LANGUAGE plpgsql;


CREATE OR REPLACE FUNCTION check_billionaire_age()
  RETURNS TRIGGER AS $check_age$
  DECLARE
    dml_year INTEGER;
  BEGIN
    dml_year := (SELECT EXTRACT(year from NEW.date_of_birth));
    check_year(dml_year); -- this is the culprit, line 20

    RETURN NEW;

  END;
$check_age$ LANGUAGE plpgsql; -- line 25


CREATE TRIGGER check_age
  BEFORE INSERT OR UPDATE ON Person
  FOR EACH ROW EXECUTE PROCEDURE check_age(); -- line 30


The error that I get is as following:

CREATE FUNCTION
psql:/path/to/my.sql:(line 25): ERROR: :  syntax error at or near
"check_year"
LINE 1: check_year( $1 )
        ^
QUERY:  check_year( $1 )
CONTEXT:  SQL statement in PL/PgSQL function "check_age" near line 5
psql:/path/to/my.sql:(line 30): ERROR:  function check_age() does not exist


Interestingly, if I append "PERFORM" before line "20" to invoke
check_year(), the error message subdues. What am I doing wrong? Do I have to
use PERFORM func() when the callee returns "void" to discard the result?

Thanks.
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