[GHC] #7788: Recursive type family causes <<loop>>

[GHC]

#7788: Recursive type family causes <<loop>>
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              Reporter:  shachaf     |            Owner:  simonpj
                  Type:  bug         |           Status:  new
              Priority:  high        |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.6.2
  (Type checker)                     |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:  Incorrect   |  Related Tickets:
  result at runtime                  |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Changes (by thomie):

 * priority:  normal => high


Comment:

 The program from the description compiles fine with 7.8.3. GHC HEAD
 (ghc-7.9.20141121) however uses a huge amount of memory very quickly until
 I have to kill the process. It seems to never get past the
 `Renamer/typechecker` phase.

 This looks like a regression, setting priority to high.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7788#comment:4>
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