#6117: Cyclic Type Class Hierarchy Produces <<loop>>
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Reporter: jun0 | Owner: simonpj
Type: bug | Status: new
Priority: normal | Milestone: 7.8.1
Component: Compiler (Type checker) | Version: 7.4.1
Keywords: | Os: Linux
Architecture: Unknown/Multiple | Failure: Incorrect result at
runtime
Difficulty: Unknown | Testcase: T6117
Blockedby: | Blocking:
Related: |
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Comment(by monoidal):
In fact, the core lint error is on much simpler:
{{{
class B a where
b :: a
newtype Additive a = Additive a
instance B a => B (Additive a) where
b = Additive b
main = undefined
}}}
This is a bit worrisome, since this is a rather natural program.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6117#comment:5>
GHC <http://www.haskell.org/ghc/>
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