Function foreach

src/master/authorization.cpp:184–192

      hashset<string> roles;

      foreach (const Resource& resource, resources) {
        const string role = getReservationRole(resource);

        if (!roles.contains(role)) {
          roles.insert(role);
          result.push_back(fromResourceWithLegacyValue(
            authorization::RESERVE_RESOURCES, resource, role));
        }
      }
    };

  // We support `Reserve` operations with either `source` set or unset. If