[GHC] #10188: prefix type-level cons can't be parsed

[GHC]

#10188: prefix type-level cons can't be parsed
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        Reporter:  Kinokkory         |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.8.4
  (Parser)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  GHC rejects       |               Test Case:
  valid program                      |                Blocking:
      Blocked By:                    |  Differential Revisions:
 Related Tickets:                    |
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Comment (by Kinokkory):

 Oh, I didn't know that. Thanks a lot!

 In a ghci:

 {{{#!hs
 > :kind! '(:::)
 '(:::) :: k -> Listy k -> Listy k
 = forall (k :: BOX). (':::)
 > :kind! (':::)

 <interactive>:1:3: parse error on input ‘:::’
 > :kind! (':)

 <interactive>:1:3: parse error on input ‘:’
 }}}

 The message "forall (k :: BOX). (':::)" seems inconsistent with the
 parsing mechanism that allows "'(:::)" instead of (':::). I'll report this
 as another new bug!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10188#comment:5>
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