make(T)          channel    unbuffered channel of type T
make(T, n)       channel    buffered channel of type T, buffer size n
</pre>


<p>
Each of the size arguments <code>n</code> and <code>m</code> must be of integer type
or an untyped <a href="#Constants">constant</a>.
A constant size argument must be non-negative and <a href="#Representability">representable</a>