Added a test to make sure we never break ecj again.

test/ecj/SimpleTest.java

@@ -0,0 +1,10 @@
+@lombok.Data
+public class SimpleTest {
+	private final String test;
+	private final int foo;
+	
+	public String bar() {
+		int val = getFoo() + 5;
+		return new SimpleTest("", 0).toString() + val;
+	}
+}