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In the last there was RLS that did exactly that. But the approach of rust-analyzer was found to be more performant.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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chalk
An implementation and definition of the Rust trait system using a PROLOG-like logic solver (by rust-lang)
rust-analyzer already uses chalk (https://github.com/rust-lang/chalk) which should replace the current trait resolver.
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There is also polonius (https://github.com/rust-lang/polonius) which should replace the borrow checker but does not receive a lot of development resources.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.