1 files changed, 23 insertions, 0 deletions
diff --git a/Haskell-book/18/Instance/src/Nope.hs b/Haskell-book/18/Instance/src/Nope.hs
new file mode 100644
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+++ b/Haskell-book/18/Instance/src/Nope.hs
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+module Nope where
+
+import Test.QuickCheck
+import Test.QuickCheck.Checkers
+
+data Nope a = NopeDotJpg deriving (Show, Eq)
+
+instance Functor Nope where
+    fmap _ _ = NopeDotJpg
+
+instance Applicative Nope where
+    pure _ = NopeDotJpg
+    _ <*> _ = NopeDotJpg
+
+instance Monad Nope where
+    return _ = NopeDotJpg
+    _ >>= _ = NopeDotJpg
+
+instance Arbitrary (Nope a) where
+    arbitrary = return NopeDotJpg
+
+instance EqProp (Nope a) where
+    (=-=) = eq