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+I did not run nor test any of the solutions I wrote for the exercises of this
+lecture.
+
+This was not a choice. In fact, running
+
+	$ runhaskell JoinList.hs
+
+produces a compilation error. The error writes about topics that have not even
+been introduced yet by lectures, such as `Applicative` and `Monad`, and focuses
+on code that has been provided by the lecturer, which is supposed to be correct.
+Because of that, I am not going to investigate the error any further. If the
+provided code worked back when this edition of the course was held, then the
+issue probably concerns important changes in the Haskell language and its base
+modules.
+
+Despite all I have said, when commenting out the `main` function in JoinList.hs
+and the `Editor` module import statement, my exercise solutions show no
+compilation errors at all, which means that the code is syntactically correct.
+The only issues that might arise concern the logic of such code. However, it all
+looks logically correct to me.
+
+If you manage to run the code and find logic errors in my solutions, feel free
+to report them.