Method isAlias

include/ast/component/declarator.h:182–182

    return std::holds_alternative<std::unique_ptr<DefType>>(Decl);
  }
  bool isAlias() const noexcept { return std::holds_alternative<Alias>(Decl); }
  bool isExportDecl() const noexcept {
    return std::holds_alternative<ExportDecl>(Decl);
  }