[unrelated] Add TracingOption.toString
diff --git a/plugins/org.eclipse.ocl.pivot/src/org/eclipse/ocl/pivot/utilities/TracingOption.java b/plugins/org.eclipse.ocl.pivot/src/org/eclipse/ocl/pivot/utilities/TracingOption.java
index 0426590..0f07e00 100644
--- a/plugins/org.eclipse.ocl.pivot/src/org/eclipse/ocl/pivot/utilities/TracingOption.java
+++ b/plugins/org.eclipse.ocl.pivot/src/org/eclipse/ocl/pivot/utilities/TracingOption.java
@@ -154,4 +154,9 @@
 		this.state = state;
 		resolved = true;
 	}
+
+	@Override
+	public String toString() {
+		return option + "=" + state;
+	}
 }