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https://bugs.gentoo.org/750206
--- a/Data/Concurrent/Deque/Reference.hs
+++ b/Data/Concurrent/Deque/Reference.hs
@@ -27,7 +27,7 @@ import Data.IORef
#ifdef USE_CAS
#warning "abstract-deque: reference implementation using CAS..."
-import Data.CAS (atomicModifyIORefCAS)
+import Data.Atomics (atomicModifyIORefCAS)
-- Toggle these and compare performance:
modify = atomicModifyIORefCAS
_is_using_CAS = True
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