Data.Typeable: types which should compare equal don't
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
Trac metadata
Trac field | Value |
---|---|
Version | 7.4.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | libraries/base |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |