function param problem in 7.3

I have create a function in 7.2:

CREATE FUNCTION left(text,int2) RETURNS varchar AS '
DECLARE
BEGIN
RETURN substring($1,1,$2)::varchar;
END;'
language 'plpgsql';

I execute a function in 7.2:

test=# select left('pippo',2)\g
left
------
pi
(1 row)

I execute a function in 7.3:

test=# select left('pippo',2)\g
ERROR: Function left("unknown", integer) does not exist
Unable to identify a function that satisfies the given argument types
You may need to add explicit typecasts

test=# select left('pippo'::text,2::int2)\g
left
------
pi
(1 row)

why in 7.2 this function worked while in 7.3 it does not work?

Thanks

Bye !!
Frank Lupo (Wolf) !!

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