[GHC] #15959: If a type signature is too long to read left-to-right then let it read top-to-bottom.

[GHC]

#15959: If a type signature is too long to read left-to-right then let it read top-
to-bottom.
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        Reporter:  philderbeast      |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.6.3
       Component:  Compiler          |              Version:  8.6.2
      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 simonpj):

 Yes, good idea!  Should not be too difficult.  See `IfaceType` which is
 where the main pretty-printer is.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15959#comment:2>
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