RustRover doesn't accept stdlib from `latest` toolchain

[wiggleforlife]

I'm using Fenix's monthly source in both a flake and a shell.nix file with direnv. Using fenix.default.toolchain in the buildInputs works when compiling using Cargo, but when trying to sync in RustRover, the IDE complains about no stdlib being available.

I've tried specifying all sorts of directories inside the derivation as well as just letting RR try to find the lib. The fenix.latest.toolchain stdlib works perfectly fine in RR. I think this has been happening for a month or two, but I'm not sure.

[eureka-cpu]

Is this still an issue? have you tried opening RR from the terminal after entering a devshell?

[billf]

latest contains rust-src. default does not contain rust-src.

nix-repl> inputs.nixpkgs.lib.hasAttr "rust-src" inputs.fenix.packages.aarch64-darwin.latest
true

nix-repl> inputs.nixpkgs.lib.hasAttr "rust-src" inputs.fenix.packages.aarch64-darwin.default
false

[eureka-cpu]

latest contains rust-src. default does not contain rust-src.

nix-repl> inputs.nixpkgs.lib.hasAttr "rust-src" inputs.fenix.packages.aarch64-darwin.latest
true

nix-repl> inputs.nixpkgs.lib.hasAttr "rust-src" inputs.fenix.packages.aarch64-darwin.default
false

IIRC default is just the minimal toolchain so that makes sense.

[billf]

IIRC default is just the minimal toolchain so that makes sense.

Using fenix.default.toolchain in the buildInputs works when compiling using Cargo, but when trying to sync in RustRover, the IDE complains about no stdlib being available.

which also makes sense... there is no stdlib available in default for RR to find. the "works in Cargo" is a red herring, it doesn't need it.

[eureka-cpu]

The readme states: The default profile of the nightly [toolchain](https://github.com/nix-community/fenix#toolchain), sometimes lags behind the minimal profile. This could maybe be a bit clearer.

[wiggleforlife]

I don't have this set up at the moment, but if default is just minimal, why is the opening sentence of the README Fenix provides the minimal, default, and complete profiles of rust toolchains? I think this is a bit misleading - it gives the impression that default is a unique profile.

[eureka-cpu]

Yep, agreed. See my above comment. I'll try to make time for this over the weekend, lots to do 🙂