Use `define-type' to make docs clearer.
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@ -94,7 +94,7 @@ to describe an infinite family of data. For example, this is the type
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of binary trees of numbers.
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@racketblock[
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(Rec BT (U Number (Pair BT BT)))]
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(define-type BinaryTree (Rec BT (U Number (Pair BT BT))))]
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The @racket[Rec] type constructor specifies that the type @racket[BT]
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refers to the whole binary tree type within the body of the
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