[EXIM] domain pattern in route_list

I seem to be unable to use a domain pattern other than a simple
domain name in route_list. In my configuration file's router
section:

    local:
      driver = domainlist
      transport = local_smtp
      route_list = "bar:foo $domain byname"

    local2:
      driver = domainlist
      transport = local_smtp
      route_list = "foo $domain byname" 

Running "exim -d9 -bt user@foo":

    Exim version 2.02 debug level 9 uid=234 gid=234
    ...
    local router called for wmb@foo
      route_domain = foo
    routelist_item = bar:foo $domain byname
    after handling route_lists items, matched = 0
    local router failed
    local2 router called for wmb@foo
      route_domain = foo
    routelist_item = foo $domain byname
    after handling route_lists items, matched = 1

What have I missed that causes router "local" to fail to match?

Thanks..
--
Bill Brelsford
k2di@???

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