[GHC] #8113: Cannot override ghci builtin commands with :def[!]

[GHC]

#8113: Cannot override ghci builtin commands with :def[!]
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        Reporter:  duncan            |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  GHCi              |          Version:  7.6.3
      Resolution:                    |         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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Comment (by hvr):

 fyi, here's a working patch for GHC 7.6.3 (but it should be the same for
 GHC HEAD)

 https://github.com/hvr/ghci-
 ng/commit/f480f2e444f9e225ece843f449c5f14df67adfe6

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8113#comment:6>
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