step 8 for spec

Author: RenZihou

docs/step8/spec.md

@@ -27,7 +27,7 @@
 <span class="SpecRuleIndicator">    |</span> <span class="SpecToken">'if'</span> <span class="SpecToken">'('</span> <span class="SpecRule">expression</span> <span class="SpecToken">')'</span> <span class="SpecRule">statement</span> <span class="SpecOperator">(</span><span class="SpecToken">'else'</span> <span class="SpecRule">statement</span><span class="SpecOperator">)?</span>
 <span class="SpecRuleIndicator">    |</span> <span class="SpecRule">compound_statement</span>
 <div class="changed"><span class="SpecRuleIndicator">    |</span> <span class="SpecToken">'for'</span> <span class="SpecToken">'('</span> <span class="SpecRule">expression</span><span class="SpecOperator">?</span> <span class="SpecToken">';'</span> <span class="SpecRule">expression</span><span class="SpecOperator">?</span> <span class="SpecToken">';'</span> <span class="SpecRule">expression</span><span class="SpecOperator">?</span> <span class="SpecToken">')'</span> <span class="SpecRule">statement</span>
-<span class="SpecRuleIndicator">    |</span> <span class="SpecToken">'for'</span> <span class="SpecToken">'('</span> <span class="SpecRule">declaration</span> <span class="SpecRule">expression</span><span class="SpecOperator">?</span> <span class="SpecToken">';'</span> <span class="SpecRule">expression</span><span class="SpecOperator">?</span> <span class="SpecToken">')'</span> <span class="SpecRule">statement</span>
+<span class="SpecRuleIndicator">    |</span> <span class="SpecToken">'for'</span> <span class="SpecToken">'('</span> <span class="SpecRule">declaration</span> <span class="SpecToken">';'</span><span class="SpecRule">expression</span><span class="SpecOperator">?</span> <span class="SpecToken">';'</span> <span class="SpecRule">expression</span><span class="SpecOperator">?</span> <span class="SpecToken">')'</span> <span class="SpecRule">statement</span>
 <span class="SpecRuleIndicator">    |</span> <span class="SpecToken">'while'</span> <span class="SpecToken">'('</span> <span class="SpecRule">expression</span> <span class="SpecToken">')'</span> <span class="SpecRule">statement</span>
 <span class="SpecRuleIndicator">    |</span> <span class="SpecToken">'break'</span> <span class="SpecToken">';'</span>
 <span class="SpecRuleIndicator">    |</span> <span class="SpecToken">'continue'</span> <span class="SpecToken">';'</span>