[GHC] #10527: Panic Simplifier ticks exhausted with type families

[GHC]

#10527: Panic Simplifier ticks exhausted with type families
-------------------------------------+-------------------------------------
        Reporter:  sopvop            |                   Owner:  bgamari
            Type:  bug               |                  Status:  new
        Priority:  highest           |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.10.1-rc1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------

Comment (by bgamari):

 The whittled down test case can be found here,
 https://github.com/bgamari/ghc-T10527/blob/master/Bug3.hs. It've been
 testing with,

 {{{
 ghc -fforce-recomp -O Bug3.hs -fsimpl-tick-factor=4 -dshow-passes
 -dverbose-core2core -ddump-rule-firings -ddump-rules -ddump-rule-rewrites
 -dsuppress-coercions -ddump-inlinings -ddump-to-file >|ghc.log 2>&1;
 }}}

 With both the current state of the `ghc-7.10` branch and
 `ghc-7.10.1-release`. Note that this test case been reduced to the bare
 minimum to reproduce on 7.10.2 yet not on 7.10.1. Lowering `simpl-tick-
 factor` to 3 causes it to fail on both.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10527#comment:14>
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