shell.nix for rust

nightly

let
  moz_overlay = import (fetchTarball {
    url = "https://github.com/mozilla/nixpkgs-mozilla/archive/3f3fba4e2066f28a1ad7ac60e86a688a92eb5b5f.tar.gz";
    sha256 = "sha256:1mrj89gzrzhci4lssvzmmk31l715cddp7l39favnfs1qaijly814";
  });
  nixpkgs = import (fetchTarball {
    url =
      "https://github.com/nixOS/nixpkgs/archive/21.05.tar.gz";
    sha256 = "sha256:1ckzhh24mgz6jd1xhfgx0i9mijk6xjqxwsshnvq789xsavrmsc36";
  }) { overlays = [ moz_overlay ]; };
in nixpkgs.mkShell {
  buildInputs = [
    (nixpkgs.rustChannelOf {
      date = "2021-07-18";
      channel = "nightly";
    }).rust
  ];
}

stable

let
  moz_overlay = import (fetchTarball {
    url = "https://github.com/mozilla/nixpkgs-mozilla/archive/3f3fba4e2066f28a1ad7ac60e86a688a92eb5b5f.tar.gz";
    sha256 = "sha256:1mrj89gzrzhci4lssvzmmk31l715cddp7l39favnfs1qaijly814";
  });
  nixpkgs = import (fetchTarball {
    url =
      "https://github.com/nixOS/nixpkgs/archive/21.05.tar.gz";
    sha256 = "sha256:1ckzhh24mgz6jd1xhfgx0i9mijk6xjqxwsshnvq789xsavrmsc36";
  }) { overlays = [ moz_overlay ]; };
in nixpkgs.mkShell {
  buildInputs = [
    (nixpkgs.rustChannelOf {
      version = "1.53";
      channel = "stable";
    }).rust
  ];
}