[GHC] #10072: Panic: generalised wildcards in RULES

[GHC]

#10072: Panic: generalised wildcards in RULES
-------------------------------------+-------------------------------------
        Reporter:  thomasw           |                   Owner:  thomasw
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler (Type    |                 Version:  7.10.1-rc2
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  Compile-time      |               Test Case:
  crash                              |                Blocking:
      Blocked By:                    |  Differential Revisions:
 Related Tickets:                    |
-------------------------------------+-------------------------------------

Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"5ab7518f28e89515c73ff09acd48b5acab48b8a5/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="5ab7518f28e89515c73ff09acd48b5acab48b8a5"
 Improve typechecking of RULEs, to account for type wildcard holes

 This fixes Trac #10072. Previously the type-hole constraint was
 escaping to top level, but it belongs in the scope of the skolems
 bound by the RULE.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10072#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler