#4302: Impossible when deriving empty data declaration
-------------------------------+--------------------------------------------
Reporter: mitar | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.12.3 | Keywords:
Testcase: | Blockedby:
Os: Linux | Blocking:
Architecture: x86_64 (amd64) | Failure: None/Unknown
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When trying to load following code into GHCi I get an error:
{{{
ghc: panic! (the 'impossible' happened)
(GHC version 6.12.3 for x86_64-unknown-linux):
TcGenDeriv:mk_FunBind
}}}
Code is:
{{{
{-# LANGUAGE StandaloneDeriving, EmptyDataDecls #-}
module Test where
data Test
deriving instance Show (Test)
}}}
Probably `Test` cannot be made instance of `Show` but still error should
be less fatal. ;-)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4302>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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