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());
         }
     }
     

src/tactic/bv/bit_blaster_tactic.cpp

@@ -141,7 +141,7 @@ public:
             (*m_imp)(g, result);
         }
         catch (rewriter_exception & ex) {
-            throw tactic_exception(ex.msg());
+            throw tactic_exception(ex.what());
         }
     }
 

src/tactic/core/propagate_values_tactic.cpp

@@ -238,7 +238,7 @@ public:
             run(in, result);
         }
         catch (rewriter_exception & ex) {
-            throw tactic_exception(ex.msg());
+            throw tactic_exception(ex.what());
         }
     }
     

src/tactic/core/simplify_tactic.cpp

@@ -98,7 +98,7 @@ void simplify_tactic::operator()(goal_ref const & in,
         m_clean = false;
     }
     catch (rewriter_exception & ex) {
-        throw tactic_exception(ex.msg());
+        throw tactic_exception(ex.what());
     }
 }
 

src/tactic/dependent_expr_state_tactic.h

@@ -129,7 +129,7 @@ public:
                 m_simp->reduce();
         }
         catch (rewriter_exception& ex) {
-            throw tactic_exception(ex.msg());
+            throw tactic_exception(ex.what());
         }
         m_goal->elim_true();
         m_goal->elim_redundancies();

src/tactic/fpa/fpa2bv_tactic.cpp

@@ -136,7 +136,7 @@ public:
             (*m_imp)(in, result);
         }
         catch (rewriter_exception & ex) {
-            throw tactic_exception(ex.msg());
+            throw tactic_exception(ex.what());
         }
     }
 

src/tactic/tactic.cpp

@@ -196,7 +196,7 @@ void exec(tactic & t, goal_ref const & in, goal_ref_buffer & result) {
         t.cleanup();
     }
     catch (tactic_exception & ex) {
-        IF_VERBOSE(TACTIC_VERBOSITY_LVL, verbose_stream() << "(tactic-exception \"" << escaped(ex.msg()) << "\")\n");
+        IF_VERBOSE(TACTIC_VERBOSITY_LVL, verbose_stream() << "(tactic-exception \"" << escaped(ex.what()) << "\")\n");
         t.cleanup();
         throw ex;
     }
@@ -215,7 +215,7 @@ lbool check_sat(tactic & t, goal_ref & g, model_ref & md, labels_vec & labels, p
         exec(t, g, r);
     }
     catch (z3_exception & ex) {
-        reason_unknown = ex.msg();
+        reason_unknown = ex.what();
         if (r.size() > 0) pr = r[0]->pr(0);
         return l_undef;
     }

src/tactic/tactic_exception.h

@@ -26,7 +26,7 @@ protected:
     std::string m_msg;
 public:
     tactic_exception(std::string && msg) : m_msg(std::move(msg)) {}
-    char const * msg() const override { return m_msg.c_str(); }
+    char const * what() const override { return m_msg.c_str(); }
 };
 
 #define TACTIC_CANCELED_MSG      Z3_CANCELED_MSG

src/tactic/tactical.cpp

@@ -362,7 +362,7 @@ public:
                     throw;
                 }
                 catch (z3_exception& ex) {
-                    IF_VERBOSE(10, verbose_stream() << ex.msg() << " in or-else\n");
+                    IF_VERBOSE(10, verbose_stream() << ex.what() << " in or-else\n");
                     throw;
                 }
                 catch (const std::exception &ex) {
@@ -546,7 +546,7 @@ public:
             catch (tactic_exception & ex) {
                 if (i == 0) {
                     ex_kind = TACTIC_EX;
-                    ex_msg = ex.msg();
+                    ex_msg = ex.what();
                 }
             }
             catch (z3_error & err) {
@@ -558,7 +558,7 @@ public:
             catch (z3_exception & z3_ex) {
                 if (i == 0) {
                     ex_kind = DEFAULT_EX;
-                    ex_msg = z3_ex.msg();
+                    ex_msg = z3_ex.what();
                 }
             }
         };
@@ -703,7 +703,7 @@ public:
                             curr_failed = true;
                             failed      = true;
                             ex_kind     = TACTIC_EX;
-                            ex_msg      = ex.msg();
+                            ex_msg      = ex.what();
                         }
                     }
                 }
@@ -725,7 +725,7 @@ public:
                             curr_failed = true;
                             failed      = true;
                             ex_kind     = DEFAULT_EX;
-                            ex_msg      = z3_ex.msg();
+                            ex_msg      = z3_ex.what();
                         }
                     }
                 }