#5962: Data.Typeable: types which should compare equal don't -----------------------------------------+---------------------------------- 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: | -----------------------------------------+---------------------------------- 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 _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs