#8114: GHC panic when building `thyme`
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Reporter: Ptharien's Flame | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.6.3
Resolution: | Keywords:
Operating System: MacOS X | Architecture: x86_64 (amd64)
Type of failure: Compile-time crash | Difficulty: Unknown
Test Case: | Blocked By:
Blocking: | Related Tickets:
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Comment (by monoidal):
As far as I can tell, the origin of the STG Lint error is Data.Text.Array
in the text package.
Here's the crucial part of that module. To reproduce, save this code as
Array.hs and compile with `ghc -dstg-lint Array`. This gives a Lint error
in 7.6.3 and HEAD.
{{{
{-# LANGUAGE MagicHash, RecordWildCards, UnboxedTuples #-}
module Array where
import GHC.Base (ByteArray#, MutableByteArray#, unsafeCoerce#)
import GHC.ST (ST(..), runST)
data Array = Array {
aBA :: ByteArray#
}
data MArray s = MArray {
maBA :: MutableByteArray# s
}
unsafeFreeze :: MArray s -> ST s Array
unsafeFreeze MArray{..} = ST $ \s# ->
(# s#, Array (unsafeCoerce# maBA) #)
}}}
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8114#comment:1>
GHC <http://www.haskell.org/ghc/>
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