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T20363.hs:23:10: error:
• The newtype constructor pattern
does not have a fixed runtime representation.
Its kind is:
TYPE NilRep
(Use -fprint-explicit-coercions to see the full type.)
NB: GHC does not (yet) support rewriting in runtime representations.
Please comment on GHC ticket #13105 if this is causing you trouble.
<https://gitlab.haskell.org/ghc/ghc/-/issues/13105>
• In the pattern: MkNT (##)
In an equation for ‘test1b’: test1b (MkNT (##)) = 0
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