public ParseTree get(String label) {
		List<ParseTree> parseTrees = labels.get(label);
		if ( parseTrees==null || parseTrees.size()==0 ) {
			return null;
		}

		return parseTrees.get( parseTrees.size()-1 ); // return last if multiple
	}
Get the last node associated with a specific {@code label}.

<p>For example, for pattern {@code <id:ID>}, {@code get("id")} returns the
node matched for that {@code ID}. If more than one node
matched the specified label, only the last is returned. If there is
no node associated with the label, this returns {@code null}.</p>

<p>Pattern tags like {@code <ID>} and {@code <expr>} without labels are
considered to be labeled with {@code ID} and {@code expr}, respectively.</p>

@param label The label to check.

@return The last {@link ParseTree} to match a tag with the specified
label, or {@code null} if no parse tree matched a tag with the label.
runtime/Java/src/org/antlr/v4/runtime/tree/pattern/ParseTreeMatch.java