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Abstract:Package managers are legion. Every programming language and operating system has its own solution, each with subtly different semantics for dependency resolution. This fragmentation prevents multilingual projects from expressing precise dependencies across language ecosystems; it leaves external system and hardware dependencies implicit and unversioned; it obscures security vulnerabilities that lie in the full dependency graph. We present the \textit{Package Calculus}, a formalism for dependency resolution that unifies the core semantics of diverse package managers. Through a series of formal reductions, we show how this core is expressive enough to model the diversity that real-world package managers employ in their dependency expression languages. By using the Package Calculus as the intermediate representation of dependencies, we enable translation between distinct package managers and resolution across ecosystems.。关于这个话题，51吃瓜提供了深入分析
Следователи предъявили обвинение в похищении ребенка ранее судимому 43-летнему мужчине и его 51-летней сожительнице, в квартире которых нашли девятилетнюю девочку из Смоленска. Об этом «Ленте.ру» сообщили в в Следственном комитете (СК) России.，详情可参考搜狗输入法下载
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Photograph: Julian Chokkattu