-tagOf_PrimOp IsEmptyMVarOp = ILIT(221)
-tagOf_PrimOp MkForeignObjOp = ILIT(222)
-tagOf_PrimOp WriteForeignObjOp = ILIT(223)
-tagOf_PrimOp MkWeakOp = ILIT(224)
-tagOf_PrimOp DeRefWeakOp = ILIT(225)
-tagOf_PrimOp FinalizeWeakOp = ILIT(226)
-tagOf_PrimOp MakeStableNameOp = ILIT(227)
-tagOf_PrimOp EqStableNameOp = ILIT(228)
-tagOf_PrimOp StableNameToIntOp = ILIT(229)
-tagOf_PrimOp MakeStablePtrOp = ILIT(230)
-tagOf_PrimOp DeRefStablePtrOp = ILIT(231)
-tagOf_PrimOp EqStablePtrOp = ILIT(232)
-tagOf_PrimOp ReallyUnsafePtrEqualityOp = ILIT(234)
-tagOf_PrimOp SeqOp = ILIT(235)
-tagOf_PrimOp ParOp = ILIT(236)
-tagOf_PrimOp ForkOp = ILIT(237)
-tagOf_PrimOp KillThreadOp = ILIT(238)
-tagOf_PrimOp YieldOp = ILIT(239)
-tagOf_PrimOp MyThreadIdOp = ILIT(240)
-tagOf_PrimOp DelayOp = ILIT(241)
-tagOf_PrimOp WaitReadOp = ILIT(242)
-tagOf_PrimOp WaitWriteOp = ILIT(243)
-tagOf_PrimOp ParGlobalOp = ILIT(244)
-tagOf_PrimOp ParLocalOp = ILIT(245)
-tagOf_PrimOp ParAtOp = ILIT(246)
-tagOf_PrimOp ParAtAbsOp = ILIT(247)
-tagOf_PrimOp ParAtRelOp = ILIT(248)
-tagOf_PrimOp ParAtForNowOp = ILIT(249)
-tagOf_PrimOp CopyableOp = ILIT(250)
-tagOf_PrimOp NoFollowOp = ILIT(251)
-tagOf_PrimOp NewMutVarOp = ILIT(252)
-tagOf_PrimOp ReadMutVarOp = ILIT(253)
-tagOf_PrimOp WriteMutVarOp = ILIT(254)
-tagOf_PrimOp SameMutVarOp = ILIT(255)
-tagOf_PrimOp CatchOp = ILIT(256)
-tagOf_PrimOp RaiseOp = ILIT(257)
-tagOf_PrimOp BlockAsyncExceptionsOp = ILIT(258)
-tagOf_PrimOp UnblockAsyncExceptionsOp = ILIT(259)
-tagOf_PrimOp DataToTagOp = ILIT(260)
-tagOf_PrimOp TagToEnumOp = ILIT(261)
+tagOf_PrimOp TakeMaybeMVarOp = ILIT(221)
+tagOf_PrimOp IsEmptyMVarOp = ILIT(222)
+tagOf_PrimOp MkForeignObjOp = ILIT(223)
+tagOf_PrimOp WriteForeignObjOp = ILIT(224)
+tagOf_PrimOp MkWeakOp = ILIT(225)
+tagOf_PrimOp DeRefWeakOp = ILIT(226)
+tagOf_PrimOp FinalizeWeakOp = ILIT(227)
+tagOf_PrimOp MakeStableNameOp = ILIT(228)
+tagOf_PrimOp EqStableNameOp = ILIT(229)
+tagOf_PrimOp StableNameToIntOp = ILIT(230)
+tagOf_PrimOp MakeStablePtrOp = ILIT(231)
+tagOf_PrimOp DeRefStablePtrOp = ILIT(232)
+tagOf_PrimOp EqStablePtrOp = ILIT(234)
+tagOf_PrimOp ReallyUnsafePtrEqualityOp = ILIT(235)
+tagOf_PrimOp SeqOp = ILIT(236)
+tagOf_PrimOp ParOp = ILIT(237)
+tagOf_PrimOp ForkOp = ILIT(238)
+tagOf_PrimOp KillThreadOp = ILIT(239)
+tagOf_PrimOp YieldOp = ILIT(240)
+tagOf_PrimOp MyThreadIdOp = ILIT(241)
+tagOf_PrimOp DelayOp = ILIT(242)
+tagOf_PrimOp WaitReadOp = ILIT(243)
+tagOf_PrimOp WaitWriteOp = ILIT(244)
+tagOf_PrimOp ParGlobalOp = ILIT(245)
+tagOf_PrimOp ParLocalOp = ILIT(246)
+tagOf_PrimOp ParAtOp = ILIT(247)
+tagOf_PrimOp ParAtAbsOp = ILIT(248)
+tagOf_PrimOp ParAtRelOp = ILIT(249)
+tagOf_PrimOp ParAtForNowOp = ILIT(250)
+tagOf_PrimOp CopyableOp = ILIT(251)
+tagOf_PrimOp NoFollowOp = ILIT(252)
+tagOf_PrimOp NewMutVarOp = ILIT(253)
+tagOf_PrimOp ReadMutVarOp = ILIT(254)
+tagOf_PrimOp WriteMutVarOp = ILIT(255)
+tagOf_PrimOp SameMutVarOp = ILIT(256)
+tagOf_PrimOp CatchOp = ILIT(257)
+tagOf_PrimOp RaiseOp = ILIT(258)
+tagOf_PrimOp BlockAsyncExceptionsOp = ILIT(259)
+tagOf_PrimOp UnblockAsyncExceptionsOp = ILIT(260)
+tagOf_PrimOp DataToTagOp = ILIT(261)
+tagOf_PrimOp TagToEnumOp = ILIT(262)