src/vs/workbench/services/workingCopy/common/workingCopyFileService.ts/WorkingCopyFileService/registerWorkingCopyProvider
class WorkingCopyFileService:	registerWorkingCopyProvider(provider: WorkingCopyProvider): IDisposable {
		const remove = insert(this.workingCopyProviders, provider);

		return toDisposable(remove);
	}