[GHC] #10576: REPL returns list of all imported names when operator completion requested

[GHC]

#10576: REPL returns list of all imported names when operator completion requested
-------------------------------------+-------------------------------------
        Reporter:  Geraldus          |                   Owner:  thomie
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  GHCi              |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |  completions complete command
 Type of failure:  Incorrect result  |  operator
  at runtime                         |            Architecture:
      Blocked By:                    |  Unknown/Multiple
 Related Tickets:  #9996             |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by thomie):

 * owner:   => thomie
 * related:   => #9996


Comment:

 Also reported as #9996.

 The problem comes from using the default `word_break_chars` when
 completing identifiers in `ghc/ghc/InteractiveUI.hs`:

 {{{
  -- We initialize readline (in the interactiveUI function) to use
  -- word_break_chars as the default set of completion word break
 characters.
  -- This can be overridden for a particular command (for example, filename
  -- expansion shouldn't consider '/' to be a word break) by setting the
 third
  -- entry in the Command tuple above.
  --
  -- NOTE: in order for us to override the default correctly, any custom
 entry
  -- must be a SUBSET of word_break_chars.
  word_break_chars :: String
  word_break_chars = let symbols = "!#$%&*+/<=>?@\\^|-~"
                         specials = "(),;[]`{}"
                         spaces = " \t\n"
                     in spaces ++ specials ++ symbols

 wrapIdentCompleter = wrapCompleter word_break_chars
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10576#comment:2>
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