[GHC] #11120: Missing type representations

[GHC]

#11120: Missing type representations
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  high              |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.11
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1774
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by bgamari):

 The principle difficulty here is the following:

  * The first thing that we do during type checking is construct a
 `GHC.Types.Module` binding to represent the module being compiled. This is
 necessary since we must refer to this binding when generating implicits
 for the data types which we later typecheck
  * When we compile `GHC.Types` `Module` is not yet in scope, since it is
 defined in the module we are currently compiling

 Similar issues occur with the `TyCon` and `TrName` types.

 I thought it would be possible to finagle the order of typechecking such
 that we could ensure that everything was in scope when needed. After
 playing around with a few ideas I suspect that, while this might be
 possible, the result will be too fragile to offset the benefit of unwiring
 these types. Sadly wiring-in really does seem like the simplest option
 here.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11120#comment:34>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler