[GHC] #8883: FlexibleContexts checking should happen also on inferred signature

[GHC]

#8883: FlexibleContexts checking should happen also on inferred signature
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        Reporter:  Blaisorblade      |            Owner:  jstolarek
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonpj):

 Well if you have
 {{{
 f x = g x
 g x = f (h x)
 }}}
 then `tcPolyInfer` will be called on the two bindings together.  If you
 happened to get a badly-shaped inferred theta, do you want to report an
 error for f, or for g, or both?  I think just one would do, which is what
 you have implemented.  If you want one per function, put the check in
 `mkExport` instead.  Either way it's not a big deal.

 Comments, with an example, would be a Good Thing.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8883#comment:11>
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