BUG #5805: "not determine data type" for params in comments

The following bug has been logged online:

Bug reference: 5805
Logged by: Maxim Turchin
Email address: nehxby(at)gmail(dot)com
PostgreSQL version: 8.4
Operating system: Ubuntu Linux
Description: "not determine data type" for params in comments
Details:

I use php PDO extention. If in prepared statement exists comments with
string like ":somestring", this string is parameter, and need to fill.

Example SQL:
select
/* :some_old_param, */
:someparam1,
:someparam2
from sometable;

When i fill last 2 param, and not fill first old param (in comment!), i get
error "not determine data type of parameter $1".

postgresql log:

2010-12-29 17:43:10 EET ERROR: could not determine data type of parameter
$1
2010-12-29 17:43:10 EET STATEMENT: select
/* $1, */
$2,
$3
from sometable;