[ ghc-Bugs-1246483 ] Template Haskell panic with class names

Bugs item #1246483, was opened at 2005-07-28 05:09
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Category: Template Haskell
Group: 6.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Wolfgang Thaller (wthaller)
Assigned to: Simon Peyton Jones (simonpj)
Summary: Template Haskell panic with class names

Initial Comment:
File Bug.hs:
module Bug where
foo = ''Show

Compile using:
ghc -c -fth Bug.hs

Result:
ghc-6.4.1: panic! (the `impossible' happened, GHC version 6.4.1):
        lookupDeprec GHCziShow.Show{tc 2h}

Please report it as a compiler bug to glasgow-haskell-
bugs@xxxxxxxxxxx,
or http://sourceforge.net/projects/ghc/.

The panic does not happen if the type class or one of its method is 
actually used in the same module.

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