fix #4662

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/sat/smt/sat_th.cpp

@@ -0,0 +1,37 @@
+/*++
+Copyright (c) 2020 Microsoft Corporation
+
+Module Name:
+
+    sat_th.cpp
+
+Abstract:
+
+    Theory plugins
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2020-08-25
+
+--*/
+#include "sat/smt/sat_th.h"
+#include "util/top_sort.h"
+
+namespace sat {
+    
+    /*
+     * \brief add dependency: dst depends on src.
+     */
+    void th_dependencies::add(euf::enode* src, euf::enode* dst) {
+        
+    }
+    
+    /*
+     * \brief sort dependencies.
+     */
+    void th_dependencies::sort() {
+        top_sort<euf::enode> top;
+        
+    }
+
+}