[GHC] #7627: Space in nullary unboxed tuples

[GHC]

#7627: Space in nullary unboxed tuples
---------------------------------+------------------------------------------
    Reporter:  monoidal          |       Owner:                  
        Type:  bug               |      Status:  patch           
    Priority:  normal            |   Milestone:  7.8.1           
   Component:  Compiler          |     Version:  7.6.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by igloo):

 Sounds like the right thing to me, too. I'm not sure what the best way to
 implement it is, though. Perhaps have a single token for `(##)` and tell
 the parser what it means?

 Incidentally, HEAD seems to have the unwanted space now:
 {{{
 Prelude> :t (#  #)
 (#  #) :: (# #)
 }}}
 and `:i` can't understand the unboxed unit tuple, although it does work
 for others:
 {{{
 Prelude> :i (##)

 Top level: Not in scope: `##'
 Prelude> :i (# #)

 <interactive>:1:3:
     parse error (possibly incorrect indentation or mismatched brackets)
 Prelude> :i (#,#)
 data (#,#) a b = (#,#) a b      -- Defined in `GHC.Prim'
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7627#comment:5>
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