[GHC] #15721: Command `:show bindings` throws exception for bindings without `let`

[GHC]

#15721: Command `:show bindings` throws exception for bindings without `let`
-------------------------------------+-------------------------------------
        Reporter:  sighingnow        |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:
       Component:  GHCi              |              Version:  8.6.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  GHCi crash        |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  MR:97
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by osa1):

 * status:  infoneeded => patch
 * differential:   => MR:97


Comment:

 Even if there's still a bug here it'll be fixed with MR:97 where we treat
 `x = y` as `let x = y`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15721#comment:4>
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