[GHC] #16362: Deriving a class via an instance that has a TypeError constraint using standalone deriving fails during compilation.

GHC ghc-devs at haskell.org
Tue Feb 26 10:14:02 UTC 2019


#16362: Deriving a class via an instance that has a TypeError constraint using
standalone deriving fails during compilation.
-------------------------------------+-------------------------------------
        Reporter:  j9794             |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:  invalid           |             Keywords:
                                     |  CustomTypeErrors
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 Alright. Since Iavor seems convinced that this is expected behavior, I'm
 going to close this.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16362#comment:7>
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