[GHC] #13456: GHCi run commands that are not documented in Users Guide Documentation

[GHC]

#13456: GHCi run commands that are not documented in Users Guide Documentation
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        Reporter:  vanto             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by MarcelineVQ):

 Interesting:\\
 From a little testing it seems that commands that begin with a letter can
 be run with `::command` instead of `:command`\\
 Some other commands like `:!  :{  :`  do not allow `::!  ::{  ::`\\
 Oddly `::?` is accepted.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13456#comment:1>
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