Re: [GHC] #11976: Error message mentions impredicative polymorphism

28 Apr 2016

      #11976: Error message mentions impredicative polymorphism
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Simon Peyton Jones ):

 In [changeset:"4c746cb2886b06ca53a2edb62188827c3dbccce0/ghc" 4c746cb/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="4c746cb2886b06ca53a2edb62188827c3dbccce0"
 Add missing solveEqualities

 I'd missed a call to solveEqualities in the partial-type-sig case
 of TcBinds.tcUserTypeSig.

 Also the checkValidType test done there best done after inference,
 in checkInferredPolyId (and is already done there).

 Fixes Trac #11976
 }}}

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11976#comment:1
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler