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I've enjoyed using this one: https://crates.io/crates/config
I'm using a library that I wrote because I was unhappy with what was there: https://github.com/andoriyu/uclicious
I'd really recommend confy! It does exactly what you seem to want and supports YAML, TOML, and RON :)
serde makes this pretty easy, if you have no special requirements.
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.