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This code doesn’t work
data Expression = Atom String
| Sequence [Expression]
deriving (show)
I get this error:
$ runghc bug.hs
ghc: panic! (the 'impossible' happened)
(GHC version 7.4.1 for x86_64-apple-darwin):
nameModule show{tv a9J}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Am I doing something wrong, or is it indeed a bug?
Type classes start with upper case letters, so that should be
Show, notshow. Though, GHC should be giving you a decent error message instead of panicking, so that part is indeed a bug.