[GHC] #12048: Allow CustomTypeErrors in type synonyms (+ evaluate nested type family?)

[GHC]

#12048: Allow CustomTypeErrors in type synonyms (+ evaluate nested type family?)
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        Reporter:  Iceland_jack      |                Owner:  diatchki
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
                                     |  CustomTypeErrors
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by simonpj):

 * owner:   => diatchki


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12048#comment:2>
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