[GHC] #10050: template haskell Ppr missing parentheses for SigT

[GHC]

#10050: template haskell Ppr missing parentheses for SigT
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        Reporter:  aavogt            |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by adamse):

 The printing of `SigE` happens in
 [https://github.com/ghc/ghc/blob/master/libraries/template-
 haskell/Language/Haskell/TH/Ppr.hs#L172]
 and `SigT` happens in [https://github.com/ghc/ghc/blob/master/libraries
 /template-haskell/Language/Haskell/TH/Ppr.hs#L507].

 If it is always correct to put parens around a `Type :: Kind` signature
 the fix could go in the latter place otherwise `pprExp` of `SigE` could
 inspect the second argument to `SigE` to see if it is a `SigT` and only
 then put parens around it.

 What would be the correct solution?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10050#comment:1>
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