Check for varexo_det declaration and simul command incompatibility in the same mode-file

preprocessor/ModFile.cc

@@ -287,6 +287,12 @@ ModFile::transformPass()
       exit(EXIT_FAILURE);
     }
   
+  if (symbol_table.exo_det_nbr() > 0 && mod_file_struct.simul_present)
+    {
+      cerr << "ERROR: A .mod file cannot contain both a simul command and varexo_det declaration (all exogenous variables are deterministic in this case)" << endl;
+      exit(EXIT_FAILURE);
+    }
+  
   cout << "Found " << dynamic_model.equation_number() << " equation(s)." << endl;
 
   if (symbol_table.exists("dsge_prior_weight"))