[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:  new
        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):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * cc: bgamari (added)


Comment:

 This behavior was introduced in 372995364c52eef15066132d7d1ea8b6760034e6
 (`Treat banged bindings as FunBinds`).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14588#comment:1>
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