[GHC] #14170: 8.2.1 regression: GHC fails to simplify `natVal`

[GHC]

#14170: 8.2.1 regression: GHC fails to simplify `natVal`
-------------------------------------+-------------------------------------
        Reporter:  vagarenko         |                Owner:  Bodigrim
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.3
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 > I'm in great favour of adding Natural literal into core. It was
 untrivial and I didn't pursue that back then,

 As comment:2 says, it's not trivial in the sense of "only 3 lines of
 code", but it is trivial (or at least easy) in the sense of "just follow
 the pattern of `Integer`".   I often find myself liking things that are
 simple and explicable even if they do a bit more duplication than we'd
 ideally like.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14170#comment:12>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler