Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/docs/bugs/nhc13test20.hs
{- nhc13 fails with: /grp/haskell/york-nhc/lib/IRIX/nhc13comp: Error: Can't find int for (Prelude._undef, Identifier) -} data Test = Test {dummy :: Bool} main :: IO () main = print (case Test {} of Test {} -> True)