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@gmail.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;