anchor.diff:      }"
   
       rustup install stable
  +    rustup install nightly
       rustup default stable
       rustup update
   
  
positive.code: with import <nixpkgs> {};
  
  stdenv.mkDerivation {
    name = "rust-env";
    buildInputs = [
      rustup
  
negative.code: 
    # Set Environment Variables
    RUST_BACKTRACE = 1;
  
    RUST_LOG = "calx-ecs=${log_level},vitral=${log_level},calx=${log_level},display=${log_level},world=${log_level},magog=${log_level}";
  }
  