Fenix provides the minimal, default, and complete profile of rust toolchains, latest profile of nightly toolchains, nightly version of rust analyzer and its vscode extension.
It aims to be a replacement for rustup and the rust overlay provided by nixpkgs-mozilla.
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Looks cool! Haven’t taken a super close look, but can you say what the differences to Rust-overlay: a better rust toolchain provider and drop-in replacement of nixpkgs-mozilla are?
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oxalica/rust-overlay seems like a drop in replacement for nixpkgs-mozilla with more features. It includes all the rust toolchains in the past (manifests) while fenix only includes the latest.
Fenix is more of a replacement to rustup that falls back to older versions of nightly toolchains when components are missing.
oxalica/rust-overlay seems to have a different behavior:
Note: default profile on nightly may not always be available due to absense of required components. You can check availability on Rustup packages availibility.
I didn’t know about this library until now, feel free to correct me if I missed anything.
Edit: grammar
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Thanks! I don’t know oxalica/rust-overlay very well either, but I thought it was related enough that knowing the differences would be useful 
oxalica/rust-overlay has selectLatestNightlyWith to select the latest nightly toolchain which contains your selected components/extensions. It is also documented in README.
The content you quoted is kind of obsolete. It’s fixed now.
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