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-rw-r--r--tests/Properties.hs2
1 files changed, 2 insertions, 0 deletions
diff --git a/tests/Properties.hs b/tests/Properties.hs
index 1240734..c8b7e05 100644
--- a/tests/Properties.hs
+++ b/tests/Properties.hs
@@ -292,6 +292,8 @@ instance Arbitrary Rectangle where
sw <- arbitrary
sh <- arbitrary
return $ Rectangle sx sy sw sh
+ coarbitrary = undefined
+
instance Arbitrary Rational where
arbitrary = do