added line about imports for exercises to preface

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wadler 2020-05-11 12:17:04 -03:00
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commit 0a99b734ba

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@ -107,4 +107,8 @@ required to do in the class taught at Edinburgh from this textbook.
Exercises labelled "(stretch)" are there to provide an extra challenge.
Few students do all of these, but most attempt at least a few.
Exercises labelled "(practice)" are included for those who want extra practice.
Exercises labelled "(practice)" are included for those who want extra
practice.
You may need to import library functions required for the solution.