Store stack context with variable context, and pass up stack contexts when invoking methods. I don't think iirc is right?

pom.xml

@@ -9,6 +9,11 @@
 			<artifactId>commons-collections4</artifactId>
 			<version>4.0</version>
 		</dependency>
+		<dependency>
+			<groupId>com.google.guava</groupId>
+			<artifactId>guava</artifactId>
+			<version>18.0</version>
+		</dependency>
 	</dependencies>
 	<properties>
 		<maven.compiler.source>1.7</maven.compiler.source>