packages output supposed to only contain derivations

[kanashimia]

When you run nix flake check it complains that flake attribute 'packages.i686-linux.default' is not a derivation
Same with nix flake show:

$ nix flake show github:nix-community/fenix 
github:nix-community/fenix/e9dcb2bf01b002ccc05edf7ddcc5bbf09c9a8cd0
├───overlay: Nixpkgs overlay
└───packages
    ├───aarch64-darwin
error: expected a derivation

At this moment packages.<system> is supposed to be an attrset of derivations, it can't contain functions, nested attrsets, etc.
For the functionality of the above there is legacyPackages attribute, which nixpkgs uses, so can just switch to it.

Note: flakes are unstable, and their outputs aren't very though-out.

[blaggacao]

In a similar vein, I was also a bit surprised to find inputs.fenix.packages.x86_64-linux.fromToolchainFile instead of fenix.fromToolchainFile.

(it took me literally 1/2 hour to figure that out)

EDIT: nvm, I now am surprised what fromToolchainFile does but not anymore why it's system spaced. I may have assumed that fromToolchainFile is composable with makeRustPlatform instead of wrapping it.

[veehaitch]

I also frequently use nix flake show to get an idea about what a flake is offering. I can very much relate to @blaggacao; it's sometimes hard to start using specific fenix features.

[figsoda]

I haven't found a good way to fix the nix flake show or nix flake check issue, for now the readme have some type signatures and examples

[figsoda]

I opened #87 to try to fix this issue. It doesn't restructure the outputs but it does pass nix flake check and make nix flake show much more useful

[dpc]

This can be closed, I think. nix flake show works. I was surprised that it's possible to put dots in names of derivations and even

nix build github:nix-community/fenix#packages.x86_64-linux.targets.wasm32-unknown-unknown.stable.rust-std

works.