[GHC] #12363: Type application for infix

[GHC]

#12363: Type application for infix
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  lowest            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
  (Parser)                           |             Keywords:
      Resolution:                    |  TypeApplications
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Iceland_jack):

 The [[https://gist.github.com/llelf/6c01ded225877914f38a code] from
 #12507, whether or not it's supposed to compile, it would be nice to be
 able to specify the result type `r`

 {{{#!hs
 (?) :: forall r fields. Rec fields -> (fields => r) -> r
 Rec ? e = e
 }}}

 {{{#!hs
 access = record ? ?a
 }}}

 Doesn't compile, but

 {{{#!hs
 -- access :: (?a::Int) => Int
 access = (?) @Int record ?a
 }}}

 which could be `record ? @Int ?a`..

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12363#comment:10>
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