diff --git a/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/Expression.java b/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/Expression.java
index 1758ca5e1..5b2e5a86c 100644
--- a/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/Expression.java
+++ b/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/Expression.java
@@ -5,7 +5,8 @@ public class Expression {
     private Assignment assignment;
     private FunctionCall call;
 
-    public Expression() {}
+    public Expression() {
+    }
 
     public Expression(Assignment assignment, FunctionCall call) {
         this.assignment = assignment;
@@ -27,4 +28,9 @@ public class Expression {
     public void setCall(FunctionCall call) {
         this.call = call;
     }
+
+    @Override
+    public String toString() {
+        return (assignment != null ? assignment + "=" : "") + call.toString();
+    }
 }
diff --git a/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/LongArg.java b/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/LongArg.java
index 13c29b2b0..53feff376 100644
--- a/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/LongArg.java
+++ b/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/LongArg.java
@@ -13,6 +13,6 @@ public class LongArg implements ArgType {
 
     @Override
     public String toString() {
-        return String.valueOf(longValue);
+        return longValue +"L";
     }
 }
diff --git a/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/VirtDataFlow.java b/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/VirtDataFlow.java
index 74ef53709..472d21b27 100644
--- a/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/VirtDataFlow.java
+++ b/virtdata-lang/src/main/java/io/nosqlbench/virtdata/lang/ast/VirtDataFlow.java
@@ -27,4 +27,16 @@ public class VirtDataFlow {
         }
         return expressions.get(0);
     }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        for (Expression expression : expressions) {
+            sb.append(expression).append("; ");
+        }
+        if (sb.length()>0) {
+            sb.setLength(sb.length()-"; ".length());
+        }
+        return sb.toString();
+    }
 }