Add missing link

cramertj · cramertj · commit 080b884330ea · 2017-02-27T22:20:50.000-08:00
diff --git a/text/0000-variadic-generics.md b/text/0000-variadic-generics.md
@@ -129,7 +129,7 @@ impl<Head, Tail, F, R> TupleMap<F> for (Head, ...Tail)
 ```
 
 This example is derived from
-[a playground example by @eddyb]()
+[a playground example by @eddyb](https://gist.github.com/8fd29c83271f3e8744a3f618786ca1de)
 that provided inspiration for this RFC.
 
 The example demonstrates the concise, expressive code enabled
