[Dovecot] @2.0, Fatal error (Expecting '=') in trash plugin config

i've setup trash plugin as,

grep trash imap.conf
	mail_plugins = autocreate fts fts_squat fts_solr imap_quota quota trash zlib

cat plugin.conf
	plugin {
	  ...
	  trash = /data/mail/Conf/dovecot/conf.d/trash.conf
	}

cat /data/mail/Conf/dovecot/conf.d/trash.conf
	1 Spam
	2 Trash
	3 Sent
	3 Sent Messages

but, @

dovecot -n
	# 2.0.alpha1: /data/mail/Conf/dovecot/dovecot.conf
	doveconf: Fatal: Error in configuration file

/data/mail/Conf/dovecot/conf.d/trash.conf line 1: Expecting '='

bug, or change frp, v1.x in config/parsing?