[GHC] #13118: let binding tuple of lenses error not an expression

[GHC]

#13118: let binding tuple of lenses error not an expression
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        Reporter:  codygman          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              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 RyanGlScott):

 Maybe. But what is `userId`? `Nil`? `recUncons`? Without the source of the
 program you're using, we can't reproduce this!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13118#comment:1>
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