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@@ -13,7 +13,7 @@ Datatype promotion
This section describes *data type promotion*, an extension to the kind
system that complements kind polymorphism. It is enabled by
:extension:`DataKinds`, and described in more detail in the paper `Giving
-Haskell a Promotion <http://dreixel.net/research/pdf/ghp.pdf>`__, which
+Haskell a Promotion <https://dreixel.net/research/pdf/ghp.pdf>`__, which
appeared at TLDI 2012.
Motivation