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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
It also applies to regular functions that return opaque futures, e.g., fn foo() -> impl Future. This was actually an unintended consequence of how it was implemented, but there was a fair bit of discussion surrounding it: people wanted it to either be generalized to explicit future types, or not generalized to impl Future at all. Eventually, they decided to keep it for now, since the behavior can always be changed again later.
This is part of someone's lib for parsing command line arguments. https://github.com/clap-rs/clap/blob/master/src/macros.rs