[GHC] #10533: Typechecker behaves differently on Phab and on Mac

[GHC]

#10533: Typechecker behaves differently on Phab and on Mac
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        Reporter:  goldfire          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  MacOS X           |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by goldfire):

 Just rebuilt on a different Mac (both with MacOS 10.8.5) from scratch with
 the same behavior. Here is an excerpt:

 {{{
 10:40:42 ~/Documents/Programming/ghc-
 cur/testsuite/tests/typecheck/should_compile> git log -n 1
 commit 61b96a86c5342fb1c850361177d60fe855d948f6
 Author: Richard Eisenberg <eir at cis.upenn.edu>
 Date:   Fri Jun 5 09:56:21 2015 -0400

     Fix #10489

     Dang, roles are annoying.

     Test case: typecheck/should_compile/T10489
 10:40:45 ~/Documents/Programming/ghc-
 cur/testsuite/tests/typecheck/should_compile> ~/Documents/Programming/ghc-
 cur/inplace/bin/ghc-stage2 --version
 The Glorious Glasgow Haskell Compilation System, version 7.11.20150605
 10:40:53 ~/Documents/Programming/ghc-
 cur/testsuite/tests/typecheck/should_compile> ~/Documents/Programming/ghc-
 cur/inplace/bin/ghc-stage2 -ddump-tc-trace FD3.hs > ~/temp/FD3.log 2>&1
 10:41:26 ~/Documents/Programming/ghc-
 cur/testsuite/tests/typecheck/should_compile>
 }}}

 The trace is attached.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10533#comment:3>
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