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The local construct defines dynamically-scoped variables as in Common Lisp
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A call to local does not create a new variable! In effect, it makes a copy of its argument, whose original value is restored when the block is finished executing
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local extends its scope to any function called from the block in which the local statement is defined
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Perl5 introduced my, which creates true local variables whose scope is confined to the block in which they are defined
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Note: one can use my or local in any block (not just a function) enclosed in { ... } to define temporary variables of limited scope
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