Pointstamps and dynamic scopes #378
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This PR adds an implementation of a new timestamp type,
Pointstamp, that roughly speaking emulates the timestamp component of Naiad's pointstamp type. The timestamp is aVec<T>, corresponding to timestamps of nested scopes of dynamic (rather than static) depth, and the path summaries on this type represent entering, iterating within, and exiting these scopes.An example,
examples/dynamic.rs, shows off how you would write thebfs.rsexample using these constructs. It .. probably implies that this could all be a bit clearer or more idiomatic.