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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
  • Issues
  • #2449

panic with GeneralizedNewtypeDeriving and a .hs-boot file

With A.hs-boot:

module A where

data A
    deriving Show

We can get a panic:

$ ghc -c -XGeneralizedNewtypeDeriving A.hs-boot

A.hs-boot:5:13:ghc: panic! (the 'impossible' happened)
  (GHC version 6.9.20080716 for x86_64-unknown-linux):
        newTyConEtadRhs main:A.A{tc r6K}

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
Trac metadata
Trac field Value
Version 6.9
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
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Blocking
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Operating system Unknown
Architecture Unknown
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