[GHC] #14588: GHC 8.2.1 allows bang patterns in let-bindings without -XBangPatterns

[GHC]

#14588: GHC 8.2.1 allows bang patterns in let-bindings without -XBangPatterns
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        Reporter:  kmiyazato         |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      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):  Phab:D4270
       Wiki Page:                    |
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Comment (by bgamari):

 The sort of things that sneak through our testsuite never ceases to amaze
 me.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14588#comment:3>
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