[GHC] #11624: Cannot declare hs-boot declaration if there is already a value in scope

[GHC]

#11624: Cannot declare hs-boot declaration if there is already a value in scope
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        Reporter:  ezyang            |                Owner:  ezyang
            Type:  bug               |               Status:  patch
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler (Type    |              Version:  8.0.1-rc2
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10472            |  Differential Rev(s):  Phab:D1963
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"fc16690a536b74e7af72e963599471474e3df603/ghc" fc16690/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="fc16690a536b74e7af72e963599471474e3df603"
 Fix #11624, cannot declare hs-boot if already one in scope.

 I'm not sure if this fix is the "right way" to do it, but
 it solves the proximal problem, which is that lookupBindGroupOcc
 was picking out the wrong renaming for hs-boot signatures,
 which then lead to an interface file error.

 Signed-off-by: Edward Z. Yang <ezyang at cs.stanford.edu>

 Test Plan: validate

 Reviewers: simonpj, hvr, austin, bgamari

 Reviewed By: bgamari

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D1963

 GHC Trac Issues: #11624
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11624#comment:7>
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