<p>
  This change breaks backwards compatibility in small ways, some obvious&mdash;patterns with "{" and "}" behave differently&mdash;
  and some less so&mdash;treatment of escaped paths has been improved.
  The change is controlled by a <a href="/doc/godebug"><code>GODEBUG</code></a> field named <code>httpmuxgo121</code>.
  Set <code>httpmuxgo121=1</code> to restore the old behavior.
</p>

</p>

<h3 id="For_statements">For statements</h3>

<p>
A "for" statement specifies repeated execution of a block. There are three forms:
The iteration may be controlled by a single condition, a "for" clause, or a "range" clause.
</p>

<pre class="ebnf">
ForStmt = "for" [ Condition | ForClause | RangeClause ] Block .
Condition = Expression .
</pre>

</p>

<h3 id="For_statements">For statements</h3>

<p>
A "for" statement specifies repeated execution of a block. There are three forms:
The iteration may be controlled by a single condition, a "for" clause, or a "range" clause.
</p>

<pre class="ebnf">
ForStmt = "for" [ Condition | ForClause | RangeClause ] Block .
Condition = Expression .
</pre>