[GHC] #12525: Internal identifiers creeping into :show bindings

[GHC]

#12525: Internal identifiers creeping into :show bindings
-------------------------------------+-------------------------------------
           Reporter:  mniip          |             Owner:
               Type:  bug            |            Status:  new
           Priority:  low            |         Milestone:
          Component:  GHCi           |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Runtime
  Unknown/Multiple                   |  performance bug
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 When binding variables the "new" way, or defining typeclasses, some things
 that are better left unseen manage to creep into the `:show Bindings`
 list.

 {{{#!html
 <pre class="wiki">
 GHCi, version 8.1.20160725: http://www.haskell.org/ghc/  :? for help
 > :show bindings
 > x = ()
 > :show bindings
 <b>$trModule :: GHC.Types.Module = _</b>
 x :: () = _
 > class Foo a
 > :show bindings
 x :: () = _
 class Foo a
 <b>$tcFoo :: GHC.Types.TyCon = _
 $tc'C:Foo :: GHC.Types.TyCon = _
 $trModule :: GHC.Types.Module = _</b>
 </pre>
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12525>
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