[GHC] #8075: `:show imports` unknown to tab-completion

[GHC]

#8075: `:show imports` unknown to tab-completion
------------------------------------+-------------------------------------
       Reporter:  hvr               |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  GHCi              |           Version:  7.6.3
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 when pressing `TAB` after `:show `, `:show imports` is not offered by
 GHCi, i.e.:

 {{{
 Prelude> :show
 args      breaks    editor    linker    packages  prompt
 bindings  context   language  modules   prog      stop
 Prelude> :show
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8075>
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