[GHC] #12507: Can't deduce implicit parameter

[GHC]

#12507: Can't deduce implicit parameter
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        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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:                    |
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Comment (by Iceland_jack):

 Works with `Given` from reflection:

 {{{#!hs
 record :: Rec (Given Int, Given String)
 record = give (1::Int) (give "hi" Rec)

 access :: Int
 access = record ? given @Int
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12507#comment:1>
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