[GHC] #14218: GHC.Stack.HasCallStack not compatible with constraint synonyms

[GHC]

#14218: GHC.Stack.HasCallStack not compatible with constraint synonyms
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        Reporter:  ntc2              |                Owner:  (none)
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.2.2
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  typecheck/should_run/T14218
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by simonpj):

 * testcase:   => typecheck/should_run/T14218
 * status:  new => merge
 * milestone:   => 8.2.2


Comment:

 Thanks for reporting this bug. It is a rather insidious and long-standing
 one. The test I added has two cases, one for vanilla implicit parameters
 and one for call-stacks.

 Could consider merging this to 8.2, but I doubt it'll affect many people.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14218#comment:8>
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