Support flow into field of referenced objects

java/ql/test/utils/model-generator/p/InnerHolder.java

@@ -0,0 +1,31 @@
+package p;
+
+public final class InnerHolder {
+
+    private class Context {
+        private String value;
+
+        Context(String value) {
+            this.value = value;
+        }
+
+        public String getValue() {
+            return value;
+        }
+    }
+
+    private Context context = null;
+
+    public void setContext(String value) {
+        context = new Context(value);
+    }
+
+    public void explicitSetContext(String value) {
+        this.context = new Context(value);
+    }
+
+    public String getValue() {
+        return context.getValue();
+    }
+
+}