Re: [GHC] #10351: Inferred type is rejected

9 Jul 2015

      #10351: Inferred type is rejected
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        Reporter:  simonpj           |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:  fixed             |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |  typecheck/should_fail/T10351
                                     |                Blocking:
                                     |  Differential Revisions:
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Comment (by Simon Peyton Jones ):

 In [changeset:"b5aabfbdb96ba8abf2748d089f40c267c2131215/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="b5aabfbdb96ba8abf2748d089f40c267c2131215"
 Infer types with flexible contexts

 Responding to Trac #10608 and Trac #10351, I've reverted
 to making type inference infer structured constraint like
     f :: C [t] => t -> t
 even if -XFlexibleContexts is not set.  That elicits an
 error message suggesting the flag.  The result is more
 helpful than the error message you get otherwise.
 }}}

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10351#comment:5
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