[GHC] #9006: GHC accepts import of private data constructor if it has the same name as the type

[GHC]

#9006: GHC accepts import of private data constructor if it has the same name as
the type
------------------------------------------------+--------------------------
        Reporter:  Lemming                      |            Owner:
            Type:  bug                          |           Status:  closed
        Priority:  normal                       |        Milestone:
       Component:  Compiler                     |          Version:  7.8.2
      Resolution:  fixed                        |         Keywords:
Operating System:  Unknown/Multiple             |     Architecture:
 Type of failure:  GHC accepts invalid program  |  Unknown/Multiple
       Test Case:  rename/should_fail/T9006     |       Difficulty:
        Blocking:                               |  Unknown
                                                |       Blocked By:
                                                |  Related Tickets:
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Comment (by simonpj):

 Here's the commit
 {{{
 commit f964cd9c5c411f8a2383cf2b080581a5c3349661
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Fri Apr 18 23:30:18 2014 +0100

     Take account of the AvailTC invariant when importing

     In the rather gnarly filterImports code, someone had forgotten
     the AvailTC invariant:  in AvailTC n [n,s1,s2], the 'n' is itself
     included in the list of names.

  compiler/rename/RnNames.lhs                     | 80
 +++++++++++++++----------
  testsuite/tests/rename/should_fail/T9006.hs     |  3 +
  testsuite/tests/rename/should_fail/T9006.stderr |  2 +
  testsuite/tests/rename/should_fail/T9006a.hs    |  3 +
  testsuite/tests/rename/should_fail/all.T        |  3 +
  5 files changed, 59 insertions(+), 32 deletions(-)
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9006#comment:2>
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