[GHC] #14052: Significant GHCi speed regression with :module and `let` in GHC 8.2.1

[GHC]

#14052: Significant GHCi speed regression with :module and `let` in GHC 8.2.1
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        Reporter:  RyanGlScott       |                Owner:  osa1
            Type:  bug               |               Status:  merge
        Priority:  high              |            Milestone:  8.4.2
       Component:  GHCi              |              Version:  8.2.1-rc2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11547            |  Differential Rev(s):  Phab:D4478
       Wiki Page:                    |
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Changes (by osa1):

 * status:  patch => merge


Comment:

 Agreed that the error message is bad. We should probably reopen #11547 or
 open a new ticket to improve it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14052#comment:22>
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