[GHC] #11385: Unify named wildcards in different type applications

[GHC]

#11385: Unify named wildcards in different type applications
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        Reporter:  Iceland_jack      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |             Keywords:
      Resolution:                    |  NamedWildCards 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 goldfire):

 I'm assuming your `:: ...` in comment:3 are meant to be inferred, not part
 of what the user writes. Then yes. And your final example in comment:3
 should most certainly be allowed; if it's not, we've designed the thing
 very wrongly.

 And I agree with all your examples in comment:4 except, possibly, the
 last. But it's probably just simpler to accept the last example along with
 the others.

 How does this contrast with comment:9:ticket:11350? These are top-level,
 whereas those are in an instance declaration. I think it's reasonable to
 have slightly different behavior. In both cases, the function body is
 interpreted with respect to the user-written type signature for the
 function. It's just that, in the instance case, the user-written type
 signature isn't really the full story. But I think it's all OK.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11385#comment:5>
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