[GHC] #13446: Deferred type error sneaks in with -fno-defer-type-errors enabled

GHC ghc-devs at haskell.org
Sun Mar 19 00:05:59 UTC 2017


#13446: Deferred type error sneaks in with -fno-defer-type-errors enabled
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.2
  checker)                           |
      Resolution:                    |             Keywords:
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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Changes (by dfeuer):

 * cc: dfeuer (added)


Comment:

 That commit was never entirely satisfactory, as it hit the problem with a
 hammer instead of (IIRC) trying to distinguish between insoluble
 constraints in positive and negative position. Or something like that.
 Whether that relates to the problem here I couldn't say.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13446#comment:3>
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