[GHC] #12177: Relevant bindings includes shadowed bindings

[GHC]

#12177: Relevant bindings includes shadowed bindings
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        Reporter:  ezyang            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |
      Resolution:                    |             Keywords:  newcomer
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 sgillespie):

 Using the above as an example, I presume the output should look like:
 {{{
 <interactive>:1:13: error:
     • Found hole: _ :: t2
       Where: ‘t2’ is a rigid type variable bound by
                the inferred type of it :: t -> t1 -> t2 at
 <interactive>:1:1
     • In the expression: _
       In the expression: \ x -> _
       In the expression: \ x -> \ x -> _
     • Relevant bindings include
         x :: t1 (bound at <interactive>:1:8)
         it :: t -> t1 -> t2 (bound at <interactive>:1:1)
 }}}

 Fare presumption?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12177#comment:2>
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