[GHC] #15284: Can't parse ''(*) in GHC HEAD

[GHC]

#15284: Can't parse ''(*) in GHC HEAD
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.5
  (Parser)                           |
      Resolution:                    |             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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Comment (by RyanGlScott):

 True, enabling `TypeOperators` (or more specifically, `NoStarIsType`,
 which `TypeOperators` implies) works around the issue. But why is that
 extension required for this to work? Note that I'm not using `*` as a
 synonym for `Type` here.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15284#comment:3>
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