[GHC] #13905: ApplicativeDo is too strict with newtype patterns

[GHC]

#13905: ApplicativeDo is too strict with newtype patterns
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by dfeuer):

 I'm not trying to be annoying, but may I ask why you don't think it's
 fixable? Don't we already know, at this point, where the constructor name
 comes from? I see the documentation, and the documentation is fine, but I
 suspect idiomatic code will run into this, and people will likely be
 surprised to see explicit `~` laziness around newtype constructors.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13905#comment:2>
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