[GHC] #12605: UnboxedSums causes parse error on hash operator e.g. `let (#) = (+)`

[GHC]

#12605: UnboxedSums causes parse error on hash operator e.g. `let (#) = (+)`
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        Reporter:  jberryman         |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:  invalid           |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by rwbarton):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 Presumably you won't need to enable any language extensions in order to
 take advantage of optimizations that use unboxed sums. There are already
 important optimizations that introduce unboxed tuples, and they don't
 require a language extension. These language extensions just allow you to
 write unboxed sums/tuples in the surface syntax.

 I guess I'll close this ticket since I don't think we should do anything
 here, though I don't feel too strongly about it.

 By the way, the workaround for the original issue is to add a space before
 `#.`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12605#comment:4>
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