Assigning to an element of a <code>nil</code> map causes a
<a href="#Run_time_panics">run-time panic</a>.
</p>


<h3 id="Slice_expressions">Slice expressions</h3>

<p>
Slice expressions construct a substring or slice from a string, array, pointer
to array, or slice operand.
There are two variants: a simple form that specifies a low
and high bound, and a full form that also specifies a bound on the capacity.
</p>