purescript-0.12.0: tests/purs/warning/NewtypeInstance.purs
-- @shouldWarnWith MissingNewtypeSuperclassInstance module Main where import Prelude newtype X = X String derive newtype instance ordX :: Ord X
-- @shouldWarnWith MissingNewtypeSuperclassInstance module Main where import Prelude newtype X = X String derive newtype instance ordX :: Ord X