operator-include.go: Fixed inclusion of a list of files.

Now returns the value of the last evaluated expression.

operator-include.go

@@ -25,8 +25,8 @@ func evalInclude(ctx ExprContext, opTerm *term) (v any, err error) {
 
 	count := 0
 	if IsList(childValue) {
-		list, _ := childValue.([]any)
-		for i, filePathSpec := range list {
+		list, _ := childValue.(*ListType)
+		for i, filePathSpec := range *list {
 			if filePath, ok := filePathSpec.(string); ok {
 				if v, err = EvalFile(ctx, filePath); err == nil {
 					count++
@@ -47,8 +47,9 @@ func evalInclude(ctx ExprContext, opTerm *term) (v any, err error) {
 	} else {
 		err = opTerm.errIncompatibleType(childValue)
 	}
-	if err == nil {
-		v = count
+	if err != nil {
+		//v = count
+		v = nil
 	}
 	return
 }