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--- ghc-8.8.0.20190721/libraries/containers/containers/include/containers.h~	2019-06-26 20:39:26.000000000 +0000
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+++ ghc-8.8.0.20190721/libraries/containers/containers/include/containers.h	2019-07-27 08:55:10.747060247 +0000
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@@ -35,7 +35,6 @@
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 #ifdef __GLASGOW_HASKELL__
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 # define USE_ST_MONAD 1
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-# define USE_UNBOXED_ARRAYS 1
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 #endif
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 #endif