message: [Assembler] Forward unknown symbol error in expr eval through error messages
diff: @@ -219,7 +219,7 @@ long evaluate(const std::shared_ptr<Expr>& expr, const SymbolMap* variables) {
  if (variables != nullptr && variables->count(v.v) != 0) {
  value = variables->at(v.v);
  } else {
  - throw std::runtime_error("Unevaluateable literal");
  + throw std::runtime_error(QString("Unknown symbol '%1'").arg(v.v).toStdString());
  }
  }
  return value;
  @@ -242,8 +242,8 @@ std::variant<Error, long> evaluate(const QString& s, const SymbolMap* variables)
  const auto exprTreeRes = std::get<std::shared_ptr<Expr>>(exprTree);
  try {
  return {evaluate(exprTreeRes, variables)};
  - } catch (...) {
  - return {Error(-1, "Could not evaluate expression '" + s + "'")};
  + } catch (const std::runtime_error& e) {
  + return {Error(-1, e.what())};
  }
  }
  