diff --git a/src/tactic/sls/sls_strategy.h b/src/tactic/sls/sls_strategy.h
deleted file mode 100644
index d071ed168..000000000
--- a/src/tactic/sls/sls_strategy.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/*++
-Copyright (c) 2011 Microsoft Corporation
-
-Module Name:
-
-    sls_strategy.h
-
-Abstract:
-
-    A Stochastic Local Search (SLS) strategy 
-
-Author:
-
-    Christoph (cwinter) 2011-09-23
-
-Notes:
-
---*/
-#ifndef _SLS_STRATEGY_H_
-#define _SLS_STRATEGY_H_
-
-#include"assertion_set_strategy.h"
-
-MK_ST_EXCEPTION(sls_exception);
-
-class sls_st : public assertion_set_strategy {
-    struct     imp;
-    imp *      m_imp;
-    params_ref m_params;
-public:
-    sls_st(ast_manager & m, params_ref const & p = params_ref());
-    virtual ~sls_st();
-
-    ast_manager & m () const;
-
-    virtual void updt_params(params_ref const & p);
-    static  void get_param_descrs(param_descrs & r);
-    virtual void collect_param_descrs(param_descrs & r) { get_param_descrs(r); }
-
-    bool is_target(assertion_set const & s) const;
-    
-    virtual void operator()(assertion_set & s, model_converter_ref & mc);
-    
-    virtual void cleanup();
-        
-    virtual void collect_statistics(statistics & st) const;
-    virtual void reset_statistics();
-protected:
-    virtual void set_cancel(bool f);
-};
-
-inline as_st * mk_sls(ast_manager & m, params_ref const & p = params_ref()) {
-    return clean(alloc(sls_st, m, p));
-}
-
-
-as_st * mk_qfbv_sls_strategy(ast_manager & m, params_ref const & p);
-
-MK_SIMPLE_ST_FACTORY(qfbv_sls_stf, mk_qfbv_sls_strategy(m, p));
-
-#endif
diff --git a/src/util/debug.h b/src/util/debug.h
index 64cc35fcf..c45ee5aa6 100644
--- a/src/util/debug.h
+++ b/src/util/debug.h
@@ -74,29 +74,6 @@ bool is_debug_enabled(const char * tag);
 #define COMPILE_TIME_ASSERT(expr) extern char DBG_UNIQUE_NAME[expr]
 #endif
 
-template<class T>
-class class_invariant 
-{
-    T* m_class;
-    char const* m_module;
-public:
-    class_invariant(T* cls) : m_class(cls), m_module(0) {
-        SASSERT(cls->invariant());
-    }
-    class_invariant(T* cls, char const* module) : m_class(cls), m_module(module) {
-        CASSERT(module, cls->invariant());
-    }
-    ~class_invariant() {
-        if (m_module) {
-            CASSERT(m_module, m_class->invariant());
-        }
-        else {
-            SASSERT(m_class->invariant());
-        }
-    }
-private:
-};
-
 void finalize_debug();
 /*
   ADD_FINALIZER('finalize_debug();')