#3886: Standalone deriving of NFData causes panic
---------------------------------+------------------------------------------
Reporter: blarsen | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.12.1 | Keywords:
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: Compile-time crash
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Using the -XStandaloneDeriving option, I tried to generate an NFData
instance for the CNF type from the funsat 0.60 package on Hackage.
{{{
{-# LANGUAGE StandaloneDeriving #-}
module Broken where
import Funsat.Types
import Control.Parallel.Strategies
deriving instance NFData AST
}}}
With ghc 6.12.1 on 32-bit Ubuntu, the above causes a panic:
ghc: panic! (the 'impossible' happened)
(GHC version 6.12.1 for i386-unknown-linux):
genDerivBinds: bad derived class
deepseq-1.1.0.0:Control.DeepSeq.NFData{tc rou}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3886>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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