Function with defval returns error

Hi All,

Following test returns error on 8.4 cvs head. it looks like an issue

Testcase: (8.4 CVS head)
====================
CREATE OR REPLACE FUNCTION f007( a INTEGER,
b INTEGER DEFAULT 10 ) RETURNS INTEGER
AS $$
select 10;
$$ language sql;

CREATE OR REPLACE FUNCTION f007( a INTEGER DEFAULT 10,
b INTEGER DEFAULT 10,
c INTEGER DEFAULT 10) RETURNS INTEGER
AS $$
select 10;
$$ language sql;

CREATE OR REPLACE FUNCTION f007( a TIMESTAMP DEFAULT to_date('01-JUN-06
14:03:50', 'DD-MON-YY HH24:MI:SS') ) RETURNS TIMESTAMP
AS $$
select current_date::timestamp;
$$ language sql;

postgres=# SELECT f007( to_date('01-JUN-06 14:03:50', 'DD-MON-YY
HH24:MI:SS') );
ERROR: functions with parameter defaults f007(integer, integer, integer)
and f007(integer, integer) are ambiguous

I think this should not return error as the input args here is timestamp...
inputs?

Thanks,
Rushabh Lathia
www.EnterpriseDB.com