[GHC] #4012: Compilation results are not deterministic

[GHC]

#4012: Compilation results are not deterministic
-------------------------------------+-------------------------------------
        Reporter:  kili              |                   Owner:  niteria
            Type:  bug               |                  Status:  patch
        Priority:  high              |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  6.12.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D910,
                                     |  Phab:D1073, Phab:D1133, Phab:D1192
-------------------------------------+-------------------------------------

Comment (by Simon Marlow <marlowsd@…>):

 In [changeset:"10a07753ff4ac0c1285454567c926d580d0f0470/ghc" 10a0775/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="10a07753ff4ac0c1285454567c926d580d0f0470"
 Anchor type family instances deterministically

 Summary:
 This is very similar to D1073. It makes type family instances to be
 attached to a binding with a least `OccName`, therefore not depending on
 `Unique` ordering.

 Test Plan:
 * this makes `Language.Haskell.Exts.SrcLoc` deterministic
 * ./validate

 Reviewers: simonmar, austin, bgamari, simonpj

 Reviewed By: simonpj

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D1192

 GHC Trac Issues: #4012
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:116>
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