[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:  Geraldus
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  7.8.4
      Resolution:                    |             Keywords:  completions
                                     |  complete command operator
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Incorrect result  |            Test Case:  ghci/prog017
  at runtime                         |  ghci/scripts/T10576a T10576b
      Blocked By:                    |             Blocking:
 Related Tickets:  #9996             |  Differential Rev(s):  Phab:D1058
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * testcase:   => ghci/prog017 ghci/scripts/T10576a T10576b


Comment:

 Update.

 This works:
 {{{
 Prelude> (☀☀) _ _ = ()
 Prelude> x1 ☀<TAB>
 }}}

 This doesn't work:
 {{{
 Prelude> (☀☀) _ _ = ()
 Prelude> x1☀<TAB>
 }}}

 A space is needed between the variable and the operator for completion to
 work.

 To solve this nicely requires adding a function to haskeline, similar to
 `completeWord`, but which takes a predicate function instead of a list of
 escape characters.

 The tests `T10576a` and `T10576b` are marked `expect_broken` for this
 issue.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10576#comment:9>
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