>variable</em>) with index <code>v</code> in a grammar.
Because the grammar still does not exist when
this function is evaluated,
the result is an <em>open reference</em> to the respective rule.
</p>

<p>
A table is <em>fixed</em> when it is converted to a pattern
(either by calling <code>lpeg.P</code> or by using it wherein a
pattern is expected).
Then every open reference created by <code>lpeg.V(v)</code>
is corrected to refer to the rule indexed by <code>v</code> in the table.
</p>

<p>
When a table is f