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[lambda.git]
/
exercises
/
assignment5.mdwn
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Again, we've left some gaps. (The use of `type` for the first line in Haskell an
15. Choose one of these languages and fill in the gaps to complete the definition.
<a id="occurs_free"></a>
+
16. Write a function `occurs_free` that has the following type:
occurs_free : identifier -> lambda_term -> bool