#5962: Data.Typeable: types which should compare equal don't
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Reporter: NickSmallbone | Owner:
Type: bug | Status: new
Priority: normal | Component: libraries/base
Version: 7.4.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Incorrect result at runtime | Testcase:
Blockedby: | Blocking:
Related: |
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Here are two ways to construct a TypeRep for the type () -> ():
{{{
Prelude> import Data.Typeable
Prelude Data.Typeable> let unitToUnit = typeOf (\() -> ())
Prelude Data.Typeable> let unitToUnit' = mkFunTy (typeOf ()) (typeOf ())
}}}
It seems to work:
{{{
Prelude Data.Typeable> unitToUnit
() -> ()
Prelude Data.Typeable> unitToUnit'
() -> ()
}}}
But the two TypeReps are not equal:
{{{
Prelude Data.Typeable> unitToUnit == unitToUnit'
False
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5962>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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