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.
21点30分左右，让她洗漱、上床开始准备睡觉，这期间会跟她看绘本，主要是讲幼儿园是什么样的，都有谁，要听谁的话等等，给孩子内心构建起一个幼儿园的概念，让她知道这地方会有很多小朋友、很多玩具，还有老师帮助他们，有问题要先告诉老师。虽然爸爸妈妈 不跟她在一起玩了，但是天黑了，爸爸会去接她回家。
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