Add a comment to Ross's previous commit (sorry, forgot to commit my
version of that change earlier).
-----------------------------------------------------------------------------
-- No: #hide, because bits of this module are exposed by the stm package.
+-- However, we don't want this module to be the home location for the
+-- bits it exports, we'd rather have Control.Concurrent and the other
+-- higher level modules be the home. Hence:
+
-- #not-home
module GHC.Conc
( ThreadId(..)