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Diffstat (limited to 'libraries/ghc-compact/tests/T16992.hs')
| -rw-r--r-- | libraries/ghc-compact/tests/T16992.hs | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/libraries/ghc-compact/tests/T16992.hs b/libraries/ghc-compact/tests/T16992.hs new file mode 100644 index 0000000000..6505aa7b00 --- /dev/null +++ b/libraries/ghc-compact/tests/T16992.hs @@ -0,0 +1,22 @@ +import Data.Bifunctor +import Foreign.Ptr +import qualified Data.ByteString as BS +import qualified Data.ByteString.Unsafe as BS +import qualified GHC.Compact as Compact +import qualified GHC.Compact.Serialized as CompactSerialize + +-- | Minimal test case for reproducing compactFixupPointers# bug for large compact regions. +-- See Issue #16992. +main :: IO () +main = do + let + large = 1024 * 1024 * 128 + largeString = replicate large 'A' + + region <- Compact.compact largeString + + Just deserialized <- CompactSerialize.withSerializedCompact region $ \s -> do + blks <- mapM (BS.unsafePackCStringLen . bimap castPtr fromIntegral) (CompactSerialize.serializedCompactBlockList s) + CompactSerialize.importCompactByteStrings s blks + + print (Compact.getCompact deserialized == largeString) |