src/vs/workbench/services/workingCopy/common/workingCopyBackupService.ts/WorkingCopyBackupServiceImpl/deleteIgnoreFileNotFound
class WorkingCopyBackupServiceImpl:	private async deleteIgnoreFileNotFound(backupResource: URI): Promise<void> {
		try {
			await this.fileService.del(backupResource, { recursive: true });
		} catch (error) {
			if ((<FileOperationError>error).fileOperationResult !== FileOperationResult.FILE_NOT_FOUND) {
				throw error; // re-throw any other error than file not found which is OK
			}
		}
	}