@Override
		protected final ATNConfig asElementType(Object o) {
			if (!(o instanceof ATNConfig)) {
				return null;
			}

			return (ATNConfig)o;
		}
Gets the complete set of represented alternatives for the configuration
set.

@return the set of represented alternatives in this configuration set

@since 4.3
runtime/Java/src/org/antlr/v4/runtime/atn/ATNConfigSet.java