[GHC] #13069: hs-boot files permit default methods in type class (but don't typecheck them)

[GHC]

#13069: hs-boot files permit default methods in type class (but don't typecheck
them)
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        Reporter:  ezyang            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |             Keywords:  backpack hs-
      Resolution:                    |  boot
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC accepts       |  Unknown/Multiple
  invalid program                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ezyang):

 The corresponding version of this bug with hsig files was fixed with
 #13041. So it's just an hs-boot bug now.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13069#comment:5>
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