Error when starting Dovecot

[Steve Matzura]

After applying some changes to 10-master.conf as detailed at
http://wiki2.dovecot.org/HowTo/PostfixDovecotLMTP I receive the
following when trying to start:

doveconf: Fatal: Error in configuration file
/etc/dovecot/conf.d/10-master.conf
line 49: Expecting '{'

I'm trying to enable LMTP. The instructions say:

Socket configuration

The actual socket is configured in /etc/dovecot/conf.d/10-master.conf.
The LMTP service can be bound to both INET or Unix sockets. In this
example a Unix socket is placed inside the Postfix spool with
appropriate permissions set: 

service lmtp {
 unix_listener /var/spool/postfix/private/dovecot-lmtp {
   group = postfix
   mode = 0600
   user = postfix
  }
}

I copied this block and placed it in my copy of 10-master.conf. Line
49 is the first line of this block, and there's clearly a left-brace
there. The braces match, too. Thoughts?