explicitly set macos frameworks in devenv.nix (#314)

devenv.nix

@@ -1,12 +1,15 @@
-{ pkgs, ... }:
+{ pkgs, lib, ... }:
 
 {
  # https://devenv.sh/basics/
 
  # https://devenv.sh/packages/
- # manually set rust packages rather than use devenv language support because
- # it doesn't seem to be up to date for macos yet (link error)
- packages = [ ];
+ # on macos frameworks have to be explicitly specified 
+ # otherwise a linker error ocurs on rust packages
+ packages = lib.optionals pkgs.stdenv.isDarwin (with pkgs.darwin.apple_sdk; [
+ frameworks.CoreServices
+ frameworks.CoreFoundation
+ ]);
 
  # https://devenv.sh/scripts/
  scripts.hello.exec = "echo Welcome to hugr dev shell!";
@@ -19,6 +22,7 @@
  # https://devenv.sh/languages/
  # https://devenv.sh/reference/options/#languagesrustversion
  languages.rust = {
+ channel = "stable";
  enable = true;
  components = [ "rustc" "cargo" "clippy" "rustfmt" "rust-analyzer" ];
  };