#930: ghc-6.6: panic! (the 'impossible' happened) mkWWcpr: not a product GHC-
Brian-6.5.1:IdInfo.IdInfo{tc rfD}
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Reporter: briansmith | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.5
Severity: normal | Resolution:
Keywords: | Os: Unknown
Difficulty: Unknown | Architecture: Unknown
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Comment (by simonpj):
This is an annoying, known, but awkward-to-fix problem concerning
mutually-recursive modules. The problem is that when compiling the
modules *inside* a loop, a data type that is only defined at the top of
the loop looks opaque; but after the loop is done, the structure of the
data type becomes apparent.
The difficulty is then that two different bits of code have different
notions of what the data type looks like.
So far this bug has bitten only GHC itself and one other person. I need
to think carefully about how to fix it. Thanks for reporting it.
Unsatisfactory workaround: compile without -O.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/930>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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