i made a subclass of BaseTest which mixes in SchedulerTestBase, and i call

mk_scheduler()

in

setUp()

with the fs rules appended to some new rules i defined in a separate source file. the call to

mk_scheduler()

raises saying

no matches for Select(<one of my root rules>) with subject types: <list of the other root rules i declared>

for all of the `RootRule`s i've defined for all of the `@rule`s i've added. why would the scheduler say there are no matches for

Select(MyRootType)

when

RootRule(MyRootType)

is one of the rules provided to the

mk_scheduler()

call?