[GHC] #1765: :def should redefine too (ghci commands)

[GHC]

#1765: :def should redefine too (ghci commands)
------------------------------+---------------------------------------------
  Reporter:  guest            |          Owner:         
      Type:  feature request  |         Status:  new    
  Priority:  normal           |      Milestone:         
 Component:  GHCi             |        Version:  6.9    
  Severity:  normal           |       Keywords:         
Difficulty:  Unknown          |             Os:  Unknown
  Testcase:                   |   Architecture:  Unknown
------------------------------+---------------------------------------------
 To redefine a function f, one needs to first undef it. This is not a nice
 interface(or the error message should be improved to "to redefine a
 command you first need to use the :undef command. Do you want this?
 [yes/no]?").

 Suggested feature: :def can also redefine commands.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1765>
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