llvm-cov dependency missing

[lenianiva]

I have my pkgs set to

      overlays = [
        (import rust-overlay)
        (self: super: let
          toolchain = (super.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml).override { extensions = [ "rust-src" ]; };
        in {
          rustc = toolchain;
        })
      ];
      pkgs = import nixpkgs { inherit system overlays; };

but then when I have pkgs.cargo-llvm-cov as a dependency of something else, I get

error:
       … while calling the 'derivationStrict' builtin

         at /builtin/derivation.nix:9:12: (source not available)

       … while evaluating derivation 'nix-shell'
         whose name attribute is located at /nix/store/35dcag44a0ymww0vy0s4jjgxwpv9g62d-source/pkgs/stdenv/generic/make-derivation.nix:300:7

       … while evaluating attribute 'buildInputs' of derivation 'nix-shell'

         at /nix/store/35dcag44a0ymww0vy0s4jjgxwpv9g62d-source/pkgs/stdenv/generic/make-derivation.nix:347:7:

          346|       depsHostHost                = lib.elemAt (lib.elemAt dependencies 1) 0;
          347|       buildInputs                 = lib.elemAt (lib.elemAt dependencies 1) 1;
             |       ^
          348|       depsTargetTarget            = lib.elemAt (lib.elemAt dependencies 2) 0;

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: attribute 'llvmPackages' missing

       at /nix/store/35dcag44a0ymww0vy0s4jjgxwpv9g62d-source/pkgs/development/tools/rust/cargo-llvm-cov/default.nix:33:10:

           32|
           33|   llvm = rustc.llvmPackages.llvm;
             |          ^
           34|

How can I get llvmPackages to be a part of rustc?

[oxalica]

nixpkgs' packages use nixpkgs' rustc which has additional attributes and is packaged to use nixpkgs' dependencies (eg. LLVM). We are shipping binary distributed ones which use upstream (patched) LLVM.

    (self: super: let
      toolchain = (super.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml).override { extensions = [ "rust-src" ]; };
    in {
      rustc = toolchain;
    })

Please use our packages individually and not make it override nixpkgs'. We do not support it.