The latency impact of starting and stopping execution traces has been dramatically reduced.
      Execution traces may now begin or end during the garbage collection mark phase.
    </p>
    <p>
      To allow Go developers to take advantage of these improvements, an experimental

signature for a function implemented outside Go, such as an assembly routine.
</p>

<pre>
func min(x int, y int) int {
	if x &lt; y {
		return x
	}
	return y
}

func flushICache(begin, end uintptr)  // implemented externally
</pre>

<h3 id="Method_declarations">Method declarations</h3>

<p>
A method is a <a href="#Function_declarations">function</a> with a <i>receiver</i>.

A function declaration without type parameters may omit the body.
Such a declaration provides the signature for a function implemented outside Go,
such as an assembly routine.
</p>

<pre>
func flushICache(begin, end uintptr)  // implemented externally
</pre>

<h3 id="Method_declarations">Method declarations</h3>

<p>
A method is a <a href="#Function_declarations">function</a> with a <i>receiver</i>.