use rust nix

default.nix

@@ -0,0 +1,9 @@
+let 
+    pkgs = import ./dep/nixpkgs { overlays = [ (import ./dep/rust-overlay) ]; };
+    rust = pkgs.rust-bin.stable.latest.rust;
+in 
+    pkgs.mkShell {
+        buildInputs = [
+            rust
+        ];
+    }

dep/nixpkgs/default.nix

@@ -0,0 +1,2 @@
+# DO NOT HAND-EDIT THIS FILE
+import (import ./thunk.nix)

dep/nixpkgs/github.json

@@ -0,0 +1,7 @@
+{
+  "owner": "NixOS",
+  "repo": "nixpkgs",
+  "private": false,
+  "rev": "bc0144e5c9bad2e26ce15b6b75c6efc50a920889",
+  "sha256": "1q75vfjnypgvkxb4cg41kchjihpb4y122z7gqm6858088k6pdji5"
+}

dep/nixpkgs/thunk.nix

@@ -0,0 +1,9 @@
+# DO NOT HAND-EDIT THIS FILE
+let fetch = { private ? false, fetchSubmodules ? false, owner, repo, rev, sha256, ... }:
+  if !fetchSubmodules && !private then builtins.fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz"; inherit sha256;
+  } else (import <nixpkgs> {}).fetchFromGitHub {
+    inherit owner repo rev sha256 fetchSubmodules private;
+  };
+  json = builtins.fromJSON (builtins.readFile ./github.json);
+in fetch json

dep/rust-overlay/default.nix

@@ -0,0 +1,2 @@
+# DO NOT HAND-EDIT THIS FILE
+import (import ./thunk.nix)

dep/rust-overlay/github.json

@@ -0,0 +1,7 @@
+{
+  "owner": "oxalica",
+  "repo": "rust-overlay",
+  "private": false,
+  "rev": "611e6213c5563a3f46a57c600c70e0f0fd2811f3",
+  "sha256": "1z9yv2wcxpzf7y4lsv21lrvzwcvsfpgfjqsg53m5z3h5pdvap26g"
+}

dep/rust-overlay/thunk.nix

@@ -0,0 +1,9 @@
+# DO NOT HAND-EDIT THIS FILE
+let fetch = { private ? false, fetchSubmodules ? false, owner, repo, rev, sha256, ... }:
+  if !fetchSubmodules && !private then builtins.fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz"; inherit sha256;
+  } else (import <nixpkgs> {}).fetchFromGitHub {
+    inherit owner repo rev sha256 fetchSubmodules private;
+  };
+  json = builtins.fromJSON (builtins.readFile ./github.json);
+in fetch json