Bug #696: timestamp function does not work?

Sandor, Vig (sandor(dot)vig(at)audi(dot)hu) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
timestamp function does not work?

Long Description
I've wrote an application under PHP, wich uses Postgres 7.1.
After I installed the new RedHat 7.3 with Postgres 7.2 some of my
SQLs didn't worked. Mainly thoose, with the timestamp function:

timestamp(current_date, current_time)

does work under 7.1 but under 7.2 there is an parser error!
Why?

Sample Code
select current_date; O.K.
select current_time; O.K.
select current_timestamp; O.K.
select timestamp(current_date, current_time); Works only under 7.1!!!!

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