[GHC] #13545: Remove duplication between lookupSubBndrOcc and lookupExportChild

[GHC]

#13545: Remove duplication between lookupSubBndrOcc and lookupExportChild
-------------------------------------+-------------------------------------
        Reporter:  mpickering        |                Owner:  mpickering
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"fa5a73f0a86908da31ec72ce33d37a7a704a0600/ghc"
 fa5a73f0/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="fa5a73f0a86908da31ec72ce33d37a7a704a0600"
 Allow qualified names to be children in export lists

 When doing this I noticed a horrible amount of duplication between
 lookupSubBndrOcc and lookupExportChild (which I am responsible for).
 I opened #13545 to keep track of this.

 Reviewers: austin, bgamari

 Reviewed By: bgamari

 Subscribers: rwbarton, thomie

 GHC Trac Issues: #13528

 Differential Revision: https://phabricator.haskell.org/D3434
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13545#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler