Replying to [comment:7 dreixel]:
Replying to [comment:5 int-e]:
One way of fixing this would be to prepend a prime (or some other non-capital letter character) to {{{name_fs}}} in {{{TcGenDeriv.gen_Typeable_binds}}} if the given {{{tycon::TyCon}}} is a
#9858: Typeable instance for datatype and its promoted constructor is the same -------------------------------------+------------------------------------- Reporter: dreixel | Owner: dreixel Type: bug | Status: new Priority: high | Milestone: 7.10.1 Component: Compiler | Version: 7.9 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by dreixel): Replying to [comment:9 oerjan]: promoted data constructur.
Is this sufficient (...)
I believe so. It should be a really simple fix.
Nope, here is a version based simply on using different promoted kinds (that are not visible in the Typeable instance). Also works to modify Shachaf's unsafeCoerce from #10000.
{{{ {-# LANGUAGE DataKinds #-} {-# LANGUAGE AutoDeriveTypeable #-}
import Data.Typeable
data A t = A
main = print $ typeRep (Proxy :: Proxy (A :: Bool -> *)) == typeRep (Proxy :: Proxy (A :: Ordering -> *))
}}}
I think this example highlights a different limitation of Typeable, along the lines of #7897. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9858#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler