Example-macros.md

@@ -10,4 +10,5 @@ Links to some example macros. If you've written a cool macro and want to share p
 * [y-combinator](https://gist.github.com/4133116)
 * [repo with lots of examples](https://github.com/fabriceleal/SweetJsTests)
 * [null checking](https://gist.github.com/4165526)
-* [hygienic destructuring using the coffeescript-style `$do` macro](https://gist.github.com/4554165) 
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+* [hygienic destructuring using the coffeescript-style `$do` macro](https://gist.github.com/4554165)
+* [contracts](https://github.com/oleiman/sweet-contracts)
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