[GHC] #5957: signatures are too permissive

[GHC]

#5957: signatures are too permissive
-------------------------------------+-------------------------------------
        Reporter:  maeder            |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  low               |            Milestone:  ⊥
       Component:  Compiler (Type    |              Version:  7.4.1
  checker)                           |
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  typecheck/should_fail/T5957
      Blocked By:                    |             Blocking:
 Related Tickets:  #11540            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * status:  new => closed
 * resolution:   => fixed
 * related:   => #11540


Comment:

 The remaining task here (rejecting `f :: Eq a => Eq b => a -> b` without a
 language extension) is the subject of #11540, so I'll close this in favor
 of that ticket.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5957#comment:6>
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