1 files changed, 21 insertions, 0 deletions
diff --git a/src/Debris.hs b/src/Debris.hs
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--- /dev/null
+++ b/src/Debris.hs
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+{-# LANGUAGE ExistentialQuantification #-}
+
+module Debris ( Debris(..)
+              , SomeDebris(..)
+              ) where
+
+import Tank
+
+class Show a => Debris a where
+    collideTank :: a -> Tank -> Tank
+
+
+data SomeDebris = forall a. Debris a => SomeDebris a
+
+instance Show SomeDebris
+    where
+      show (SomeDebris a) = show a
+
+instance Debris SomeDebris
+    where
+      collideTank (SomeDebris a) = collideTank a