Interpreter: remove unsupported target_assertion

The iterator was never initialised, but still being compared to, which
is undefined behaviour.

Author: tautschnig

src/goto-programs/interpreter.cpp

@@ -742,9 +742,7 @@ void interpretert::execute_assert()
 {
   if(!evaluate_boolean(pc->get_condition()))
   {
-    if((target_assert==pc) || stop_on_assertion)
-      throw "program assertion reached";
-    else if(show)
+    if(show)
       error() << "assertion failed at " << pc->location_number
               << "\n" << eom;
   }

src/goto-programs/interpreter_class.h

@@ -30,14 +30,13 @@ class interpretert:public messaget
   interpretert(
     const symbol_tablet &_symbol_table,
     const goto_functionst &_goto_functions,
-    message_handlert &_message_handler):
-    messaget(_message_handler),
-    symbol_table(_symbol_table),
-    ns(_symbol_table),
-    goto_functions(_goto_functions),
-    stack_pointer(0),
-    done(false),
-    stop_on_assertion(false)
+    message_handlert &_message_handler)
+    : messaget(_message_handler),
+      symbol_table(_symbol_table),
+      ns(_symbol_table),
+      goto_functions(_goto_functions),
+      stack_pointer(0),
+      done(false)
   {
     show=true;
   }
@@ -265,11 +264,10 @@ class interpretert:public messaget
   list_input_varst function_input_vars;
 
   goto_functionst::function_mapt::const_iterator function;
-  goto_programt::const_targett pc, next_pc, target_assert;
+  goto_programt::const_targett pc, next_pc;
   goto_tracet steps;
   bool done;
   bool show;
-  bool stop_on_assertion;
   static const size_t npos;
   size_t num_steps;
   size_t total_steps;