[GHC] #14033: Invalid newtype causes GHC to panic rather than fail to compile

[GHC]

#14033: Invalid newtype causes GHC to panic rather than fail to compile
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        Reporter:  InThisStyle10s6p  |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Happily it's ok in HEAD
 {{{
 T14033.hs:5:16: error:
     • The constructor of a newtype must have exactly one field
         but ‘Zero’ has none
     • In the definition of data constructor ‘Zero’
       In the newtype declaration for ‘Zero’
   |
 5 | newtype Zero = Zero
   |                ^
 }}}
 I think a dup of #13271.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14033#comment:1>
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