part of find_symbols_visitor done

include/error_handling.hpp

@@ -0,0 +1,29 @@
+#include <iostream>
+
+enum class ErrorVisitor {
+  BuildVisitor,
+  PrintVisitor,
+  FindSymbolsVisitor,
+  // ...
+};
+
+// TODO
+inline void handle_error(std::string message, ErrorVisitor visitor) { // TODO: add place in code
+  std::string visitor_str;
+  switch (visitor) {
+    case ErrorVisitor::BuildVisitor:
+      visitor_str = "Build Visitor";
+      break;
+    case ErrorVisitor::PrintVisitor:
+      visitor_str = "Print Visitor";
+      break;
+    case ErrorVisitor::FindSymbolsVisitor:
+      visitor_str = "Find Symbols Visitor";
+      break;
+    // ...
+    default:
+      break;
+  }
+  std::cerr << "Error: " << message << " in " << visitor_str;
+  exit(1);
+}