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

[GHC]

#15721: Command `:show bindings` throws exception for bindings without `let`
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        Reporter:  sighingnow        |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  high              |            Milestone:  8.8.1
       Component:  GHCi              |              Version:  8.6.1
      Resolution:  fixed             |             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:                    |
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Changes (by RyanGlScott):

 * milestone:   => 8.8.1


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15721#comment:6>
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