6.7. Exercises

  1. The function op_null turns an op into a null op. Find all the occasions in which a null op is constructed, and explain in each case why the op has been nullified.

  2. Explain what is going on in the bottom half of Perl_utilize. (after the comment Fake up an import/unimport)

  3. Add a check for the range operator - if both sides are constant, ensure that the left is less than the right.