[GHC] #15762: ghci command: report function's inferred visible type applications

[GHC]

#15762: ghci command: report function's inferred visible type applications
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  8.6.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #15610 #15613     |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Iceland_jack):

 Would be invaluable for Ryan's
 [https://github.com/ekmett/eq/blob/9a8b1f61ad44a65c8f2ea5b900dc975658445c65/src/Data/Eq/Type/Hetero.hs
 eq] :P

 {{{#!hs
 symm :: forall (a::k) (b::j). (:==) @k @j a b -> (:==) @j @k b a
 symm ab
  = unpush @j @k @(:==) @b @a
  $ unsymm @k @j @(Push (:==)) @a @b
  $ hsubst @k @j @a @b @(Symm (Push (:==)) a) ab
  $ Symm @k @k @(Push (:==)) @a @a
  $ Push @k @k @(:==) @a @a
  $ refl @k @a
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15762#comment:2>
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