[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, while looking into implementing a `:builtin <cmd> [args]`-like
 facility I noticed it's already there, by using `::<cmd>`:

 {{{
    :def <cmd> <expr>           define command :<cmd> (later defined
 command has
                                precedence, ::<cmd> is always a builtin
 command)
 }}}

 So this leaves the issue of `:def!` not doing what it's expected to do
 (and probably to add documentation about the `::<cmd>` feature to the GHC
 user guide, as I didn't see it mentioned there).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8113#comment:4>
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