use std::exception as base class to z3_exception

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

src/tactic/arith/factor_tactic.cpp

@@ -316,7 +316,7 @@ public:
             throw ex;
         }
         catch (z3_exception & ex) {
-            throw tactic_exception(ex.msg());
+            throw tactic_exception(ex.what());
         }
     }
 

src/tactic/arith/fix_dl_var_tactic.cpp

@@ -317,7 +317,7 @@ public:
             (*m_imp)(in, result);
         }
         catch (rewriter_exception & ex) {
-            throw tactic_exception(ex.msg());
+            throw tactic_exception(ex.what());
         }
     }
     

src/tactic/arith/lia2pb_tactic.cpp

@@ -325,7 +325,7 @@ public:
             (*m_imp)(in, result);
         }
         catch (rewriter_exception & ex) {
-            throw tactic_exception(ex.msg());
+            throw tactic_exception(ex.what());
         }
     }
     

src/tactic/arith/normalize_bounds_tactic.cpp

@@ -169,7 +169,7 @@ public:
             (*m_imp)(in, result);
         }
         catch (rewriter_exception & ex) {
-            throw tactic_exception(ex.msg());
+            throw tactic_exception(ex.what());
         }
     }
     

src/tactic/arith/purify_arith_tactic.cpp

@@ -937,7 +937,7 @@ public:
             result.push_back(g.get());
         }
         catch (rewriter_exception & ex) {
-            throw tactic_exception(ex.msg());
+            throw tactic_exception(ex.what());
         }
     }
     

src/tactic/arith/recover_01_tactic.cpp

@@ -416,7 +416,7 @@ public:
             (*m_imp)(g, result);
         }
         catch (rewriter_exception & ex) {
-            throw tactic_exception(ex.msg());
+            throw tactic_exception(ex.what());
         }
     }