diff --git a/analyzer/guard.cpp b/analyzer/guard.cpp
new file mode 100644
index 0000000..2acd2c1
--- /dev/null
+++ b/analyzer/guard.cpp
@@ -0,0 +1,17 @@
+#include <analyzer/guard.hpp>
+#include <util/trace.hpp>
+
+namespace analyzer
+{
+
+//------------------------------------------------------------------------------
+
+void Guard::apply() const
+{
+    // TODO
+    trace::err("Guard::apply() currently not supported");
+}
+
+//------------------------------------------------------------------------------
+
+} // namespace analyzer