#5287: The 'impossible' happened. solveDerivEqns: probable loop
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Reporter: agocorona | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.0.3
Keywords: solveDerivEqns | Testcase:
Blockedby: | Difficulty:
Os: Windows | Blocking:
Architecture: x86 | Failure: Compile-time crash
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Comment(by YitzGale):
Discussion thread:
http://www.haskell.org/pipermail/haskell-cafe/2011-June/093559.html
Daniel Fischer reports:
* The bug also occurs when deriving Eq and Show
* The bug also occurs in 7.0.2 and 7.0.4.
* In 6.12.3, GHC reports: "Can't derive instances where the instance
context mentions
type variables that are not data type parameters".
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5287#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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