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For all exercises: no fork/exec/system/qx/open, no cmdline options,
  no user input, no modules, no tie, no bless, no %SIG.  Make sure you
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For extra points, try to make them work under strict
  (warning: for one exercise no strict solution is known (yet))

Exercise 1:  Create an array @x such that changing $x[0] also sets
    $x[1] to the same value
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Bonus Exercise:  The code snippet 'sub foo{} goto +foo' produces an
    error: "Can't find label SCALAR(0x31c70c)"  (the address may vary)
    Where does that ref come from?  What does it point to?