Found "ghc-6.4: panic!"
I have just gotten:
ghc-6.4: panic! (the `impossible' happened, GHC version 6.4):
Unify.unifyTauTyLists: mismatched type lists!
Please report it as a compiler bug to glasgow-haskell-bugs@haskell.org,
or http://sourceforge.net/projects/ghc/.
from ghci. The code I loaded is:
module ProgramOptions
where
-- newtype Command n = Command [Option n]
-- deriving (Show)
--
-- data Option n = Option { keys :: [String],
-- value :: Value n,
-- description :: String }
-- deriving (Show)
data Option = Option [String] Value String
data Num n => Value n = Boolean Bool
| Numeric n
| String String
instance Num n => Show (Value n) where
show (Boolean b) = show b
show (Numeric n) = show n
show (String s) = show s
and the whole session was:
$ ghci
___ ___ _
/ _ \ /\ /\/ __(_)
/ /_\// /_/ / / | | GHC Interactive, version 6.4, for Haskell 98.
/ /_\\/ __ / /___| | http://www.haskell.org/ghc/
\____/\/ /_/\____/|_| Type :? for help.
Loading package base-1.0 ... linking ... done.
Prelude> :l ProgramOptions
Compiling ProgramOptions ( ProgramOptions.hs, interpreted )
Ok, modules loaded: ProgramOptions.
*ProgramOptions> Option ["n", "name"] (String "Pupeno") "Name"
ghc-6.4: panic! (the `impossible' happened, GHC version 6.4):
Unify.unifyTauTyLists: mismatched type lists!
Please report it as a compiler bug to glasgow-haskell-bugs@haskell.org,
or http://sourceforge.net/projects/ghc/.
*ProgramOptions>
I am reporting mainly because the interpreter asked for it, I am very new to Haskell.
Trac metadata
Trac field | Value |
---|---|
Version | 6.4 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | GHCi |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | Unknown |
Architecture |