| ^CMake Error at .*/Modules/ExternalData\.cmake:[0-9]+ \(message\): | |
| Bad ExternalDataCustomScript key '' in URL template: | |
| ExternalDataCustomScript:///%\(algo\)/%\(hash\) | |
| The key must be a valid C identifier\. | |
| Call Stack \(most recent call first\): | |
| BadCustom2\.cmake:[0-9]+ \(ExternalData_Add_Target\) | |
| CMakeLists\.txt:[0-9]+ \(include\)$ |