Error out if an “initval” block appears after an “endval” block (without the “learnt_in=…” option)

Closes: #104

src/NumericalInitialization.cc

@@ -187,6 +187,12 @@ void
 InitValStatement::checkPass([[maybe_unused]] ModFileStructure &mod_file_struct,
                             [[maybe_unused]] WarningConsolidation &warnings)
 {
+  if (mod_file_struct.endval_present)
+    {
+      cerr << "ERROR: an 'initval' block cannot appear after an 'endval' block" << endl; // See #104
+      exit(EXIT_FAILURE);
+    }
+
   set<int> exogs = getUninitializedVariables(SymbolType::exogenous);
   set<int> endogs = getUninitializedVariables(SymbolType::endogenous);
 
@@ -253,6 +259,8 @@ void
 EndValStatement::checkPass([[maybe_unused]] ModFileStructure &mod_file_struct,
                            [[maybe_unused]] WarningConsolidation &warnings)
 {
+  mod_file_struct.endval_present = true;
+
   set<int> exogs = getUninitializedVariables(SymbolType::exogenous);
   set<int> endogs = getUninitializedVariables(SymbolType::endogenous);
 

src/Statement.hh

@@ -157,6 +157,8 @@ struct ModFileStructure
   /* Lists symbol IDs of parameters that appear in a “planner_discount” option.
      See dynare#1173 for more details. */
   set<int> parameters_in_planner_discount;
+  // Whether an endval block (without the learnt_it=… option) appears
+  bool endval_present{false};
   // Whether a shocks(surprise) block appears
   bool shocks_surprise_present{false};
   // Whether a shocks(learnt_in=…) block appears