[GHC] #11577: GHCi accepts invalid programs when recompiling

[GHC]

#11577: GHCi accepts invalid programs when recompiling
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        Reporter:  crockeea          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC accepts       |  Unknown/Multiple
  invalid program                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by thomie):

 Probably a long shot, but #11596 might be related. I that ticket, ghci
 also reports everything is fine after a `:reload`, even though the source
 code had been modified to a broken state in the meantime.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11577#comment:4>
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