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-rw-r--r--testsuite/tests/codeGen/should_compile/cg006.hs8
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diff --git a/testsuite/tests/codeGen/should_compile/cg006.hs b/testsuite/tests/codeGen/should_compile/cg006.hs
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+++ b/testsuite/tests/codeGen/should_compile/cg006.hs
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+{-# LANGUAGE MagicHash #-}
+module ShouldCompile where
+
+-- exposed a bug in the NCG in 6.4.2
+import GHC.Base
+class Unboxable a where
+ writeUnboxable :: MutableByteArray# RealWorld -> a -> State# RealWorld -> State# RealWorld
+ writeUnboxable arr a s = writeInt8Array# arr 0# (getTag 0) s