[GHC] #14225: "No module named ... is imported" message is a bit misleading with qualified imports

[GHC]

#14225: "No module named ... is imported" message is a bit misleading with
qualified imports
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  RolandSenn
            Type:  bug               |               Status:  patch
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:  make test
                                     |  TEST=T14225
      Blocked By:                    |             Blocking:
 Related Tickets:  #15611            |  Differential Rev(s):  Phab:D5331
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"4c174dddc7b36ebf97ba0e182f843d563e3d598c/ghc"
 4c174ddd/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="4c174dddc7b36ebf97ba0e182f843d563e3d598c"
 Misleading msg with qualified imports "No module named X imported"

 To check whether a given module has been imported, we do the following:
 From the list of all qualified names we extract the distinct module
 names to a list of module names.
 Then we check whether the given module name is in this list of module
 names.

 Test Plan: make test TEST=T14225

 Reviewers: mpickering, hvr, monoidal, osa1, bgamari

 Reviewed By: bgamari

 Subscribers: rwbarton, carter

 GHC Trac Issues: #14225

 Differential Revision: https://phabricator.haskell.org/D5331
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14225#comment:3>
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