switch to java 8 syntax to make github test workflow pass #28

Author: rbouckaert

src/beast/base/evolution/substitutionmodel/ComplexSubstitutionModel.java

@@ -80,7 +80,8 @@ public void initAndValidate() {
 	 * @return > 0 if data type can be inferred <= 0 if data type cannot be inferred
 	 */
 	private int getNrOfStatesInData(BEASTInterface o) {
-		if (o instanceof GenericTreeLikelihood tl) {
+		if (o instanceof GenericTreeLikelihood) {
+			GenericTreeLikelihood tl = (GenericTreeLikelihood) o;
 	        Alignment data = tl.dataInput.get();
 	        if (data.getDataType() == null) {
 	            if (data.userDataTypeInput.get() != null) {