Module cargo::util::dependency_queue
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A graph-like structure used to represent a set of dependencies and in what order they should be built.
This structure is used to store the dependency graph and dynamically update it to figure out when a dependency should be built.
Dependencies in this queue are represented as a (node, edge) pair. This is used to model nodes which produce multiple outputs at different times but some nodes may only require one of the outputs and can start before the whole node is finished.