src/vs/platform/instantiation/common/instantiationService.ts/InstantiationService/constructor
class InstantiationService:	constructor(services: ServiceCollection = new ServiceCollection(), strict: boolean = false, parent?: InstantiationService) {
		this._services = services;
		this._strict = strict;
		this._parent = parent;

		this._services.set(IInstantiationService, this);
	}