src/vs/workbench/api/common/extHostTask.ts/WorkerExtHostTask/resolveTaskInternal
class WorkerExtHostTask:	protected async resolveTaskInternal(resolvedTaskDTO: tasks.TaskDTO): Promise<tasks.TaskDTO | undefined> {
		if (CustomExecutionDTO.is(resolvedTaskDTO.execution)) {
			return resolvedTaskDTO;
		} else {
			this._logService.warn('Only custom execution tasks supported.');
		}
		return undefined;
	}