Bugs item #1246483, was opened at 2005-07-28 05:09
Message generated for change (Comment added) made by wthaller
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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-
[EMAIL PROTECTED],
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.
----------------------------------------------------------------------
>Comment By: Wolfgang Thaller (wthaller)
Date: 2005-08-03 00:13
Message:
Logged In: YES
user_id=566359
The fix causes more problems:
$ cat THClassName.hs
module THClassName where
class Foo a
baz = ''Foo
$ ghc -c -fth THClassName.hs
Bad interface file: THClassName.hi
THClassName.hi: openBinaryFile: does not exist (No such file or
directory)
It tries to load the .hi file that doesn't yet exist, which it probably
shouldn't do.
Wolfgang
----------------------------------------------------------------------
Comment By: Simon Peyton Jones (simonpj)
Date: 2005-07-28 15:53
Message:
Logged In: YES
user_id=50165
Good point. I'd fixed this in the HEAD but not the 6.4 branch.
Simon
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