@Override
	public Handle alt(List<Handle> els) {
		return elemList(els);
	}
From {@code A|B|..|Z} alternative block build

<pre>
 o-&gt;o-A-&gt;o-&gt;o (last ATNState is BlockEndState pointed to by all alts)
 |          ^
 |-&gt;o-B-&gt;o--|
 |          |
 ...        |
 |          |
 |-&gt;o-Z-&gt;o--|
</pre>

So start node points at every alternative with epsilon transition and
every alt right side points at a block end ATNState.
<p>
Special case: only one alternative: don't make a block with alt
begin/end.
<p>
Special case: if just a list of tokens/chars/sets, then collapse to a
single edged o-set-&gt;o graph.
<p>
TODO: Set alt number (1..n) in the states?
tool/src/org/antlr/v4/automata/ParserATNFactory.java