BUG #6018: ctrl +C cause data inconsistent for sync standby

The following bug has been logged online:

Bug reference: 6018
Logged by: lxzou
Email address: zoulx1982(at)163(dot)com
PostgreSQL version: 9.1beta1
Operating system: Linux
Description: ctrl +C cause data inconsistent for sync standby
Details:

Dear Sir:
I am interested in standby function of PG, so i test the new feature about
sync standby in PG9.1. I have a question, i install only one primary
postgres and no standby server. When i execute an insert statement in
primary, this statement was blocked. But when I press Ctrl + C in psql, the
statement was commited. In my view, the walsender can't send the xlog to
standby server, the statement should be rollback, but not commit; because
this will cause the data between primary and standby inconsistent.
Thank you for your time.
Look forward to your reply.