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<title>Syntax - avram - a virtual machine code interpreter</title>
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<h5 class="subsubsection">2.7.4.1 Syntax</h5>

<p><code>silly</code> has no reserved words, but it has equals signs, commas and
parentheses built in. A concise but ambiguous grammar for it can be given
as follows. 
<a name="index-syntax-253"></a><a name="index-grammar-254"></a>
<pre class="display">     
     <var>program</var> ::= <var>declaration</var>*
     
     <var>declaration</var> ::= <var>identifier</var> <code>=</code> <var>expression</var>
     
</pre>
   <p class="noindent"><a name="index-precedence-255"></a><a name="index-operator-precedence-256"></a>The real grammar is consistent with this one but enforces right
associativity for binary operations and higher precedence for juxtaposition
without intervening white space.

   <p>The declaration of any identifier must be unique and must precede its
occurrence in any expression. Hence, cyclic dependences between
declarations and &ldquo;recursive&rdquo; declarations are not allowed.

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