+toMessages :: MTaskInterval (Main (ByteCode a b)) BCState -> ([MTaskMSGSend], BCState)
+toMessages interval x s
+# (bc, newstate) = toRealByteCode (unMain x) s
+# newsdss = 'DL'.difference newstate.sdss s.sdss
+| not (trace_tn $ printToString s.sdss) = undef
+| not (trace_tn $ printToString newstate.sdss) = undef
+| not (trace_tn $ printToString newsdss) = undef
+= ([MTSds sdsi e\\{sdsi,sdsval=e}<-newsdss] ++
+ [MTTask interval bc], newstate)
+
+instance == BCShare where (==) a b = a.sdsi == b.sdsi