#4497: hmatrix-0.10.0.0 fails to build with GHC 7.0.1 (worked with
7.0.0.20101111)
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Reporter: luite | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.0.1
Keywords: hmatrix context reduction stack overflow | Testcase:
Blockedby: | Difficulty:
Os: Windows | Blocking:
Architecture: Unknown/Multiple | Failure:
None/Unknown
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Comment(by simonpj):
OK here's a tiny program with no dependencies that demonstrates the bug.
{{{
{-# LANGUAGE FlexibleContexts, MultiParamTypeClasses, TypeFamilies #-}
module T4497 where
norm2PropR a = twiddle (norm2 a) a
twiddle :: Normed a => a -> a -> Double
twiddle a b = undefined
norm2 :: e -> RealOf e
norm2 = undefined
class (Num (RealOf t)) => Normed t
type family RealOf x
}}}
Great. Dimitrios and I know what's happening. Patch coming.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4497#comment:8>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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