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chalk
An implementation and definition of the Rust trait system using a PROLOG-like logic solver (by rust-lang)
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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.
In the last there was RLS that did exactly that. But the approach of rust-analyzer was found to be more performant.
rust-analyzer already uses chalk (https://github.com/rust-lang/chalk) which should replace the current trait resolver.
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.