merge

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

src/muz/base/dl_engine_base.h

@@ -122,6 +122,7 @@ namespace datalog {
 
     class register_engine_base {
     public:
+        virtual ~register_engine_base() = default;
         virtual engine_base* mk_engine(DL_ENGINE engine_type) = 0;
         virtual void set_context(context* ctx) = 0;
     };

src/muz/rel/dl_mk_simple_joins.cpp

@@ -42,7 +42,7 @@ namespace datalog {
             /**
                \brief Number of rules longer than two that contain this pair.
 
-               This number is being updated by \c add_rule and \remove rule. Even though between
+               This number is being updated by \c add_rule and \c remove_rule. Even though between
                adding a rule and removing it, the length of a rule can decrease without this pair
                being notified about it, it will surely see the decrease from length 3 to 2 which
                the threshold for rule being counted in this counter.

src/muz/spacer/spacer_mbc.h

@@ -34,7 +34,7 @@ public:
     typedef obj_map<func_decl, unsigned> partition_map;
 
     /**
-       \Brief Model Based Cartesian projection of lits
+       \brief Model Based Cartesian projection of lits
      */
     void operator()(const partition_map &pmap, expr_ref_vector &lits, model &mdl,
                     vector<expr_ref_vector> &res);