src/vs/platform/extensionManagement/node/extensionsScanner.ts/ExtensionsScanner/scanDevSystemExtensions
class ExtensionsScanner:	private async scanDevSystemExtensions(): Promise<ILocalExtension[]> {
		const devSystemExtensionsList = this.getDevSystemExtensionsList();
		if (devSystemExtensionsList.length) {
			const result = await this.scanExtensionsInDir(this.devSystemExtensionsPath, ExtensionType.System);
			this.logService.trace('Scanned dev system extensions:', result.length);
			return result.filter(r => devSystemExtensionsList.some(id => areSameExtensions(r.identifier, { id })));
		} else {
			return [];
		}
	}