#5496: Reify class instances
------------------------+---------------------------------------------------
Reporter: zzo38 | Owner:
Type: bug | Status: new
Priority: normal | Component: Template Haskell
Version: 7.0.3 | Keywords:
Testcase: | Blockedby:
Os: Windows | Blocking:
Architecture: x86 | Failure: None/Unknown
------------------------+---------------------------------------------------
<interactive>:1:3:
Exception when trying to run compile-time code:
<interactive>: panic! (the 'impossible' happened)
(GHC version 7.0.3 for i386-unknown-mingw32):
reifyType PredTy
<pred>base:GHC.Num.Num{tc 2b}
integer-gmp:GHC.Integer.Type.Integer{tc 314}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Code: (>>)
(>>=)
(>>=)
classInstances 'Num [Language.Haskell.TH.Syntax.ConT
'Integer]
(.) reify head
(.) runIO print
[| 0 |]
In the expression:
$(classInstances 'Num [ConT 'Integer] >>= reify . head
>>= runIO . print
>>
[| 0 |])
In an equation for `it':
it
= $(classInstances 'Num [ConT 'Integer] >>= reify . head
>>= runIO . print
>>
[| 0 |])
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5496>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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