[GHC] #9111: base should export Typeable instances of its promoted data constructors

[GHC]

#9111: base should export Typeable instances of its promoted data constructors
-------------------------------------+------------------------------------
        Reporter:  goldfire          |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
-------------------------------------+------------------------------------

Comment (by goldfire):

 My original report was intended to suggest instances for all promotable
 types in base/ghc-prim that export `Typeable` instances for the unpromoted
 types, like `[]`, `Bool`, `Maybe`, `Either`, `Ordering`, tuples, etc.
 While we're at it, we should probably export `Typeable` instances for
 ''classes'', too, like `Eq` and `Monad`, among many others.

 If no one sees a downside to adding these instances, I can submit a patch
 yes.

 For the problem reported in the first comment -- about a `Typeable`
 instance for `Symbol`s (and presumably `Nat`s) -- the implementation
 technique is somewhat different and might best be something for Iavor.
 [http://www.haskell.org/pipermail/haskell-cafe/2013-August/109993.html
 This message] from August 2013 suggests that he is on it, but I don't know
 if there has been progress since then.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9111#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler