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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.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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This is part of someone's lib for parsing command line arguments. https://github.com/clap-rs/clap/blob/master/src/macros.rs
NOTE:
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Hence, a higher number means a more popular project.