Use Rust from fenix in flake (#25)

* switch to fenix

* pin rust version to 1.81.0 in ci

* use Rust 1.80.1 due to deprecation

* use toolchain version in rs-cargo

* backout of commit 72bbfdb

* backout of commit 3501a32

* backout of commit d2d9ace

* Rust 1.82.0

---------

Co-authored-by: GearsDatapacks <surya@seriousinfinitude.com>

compiler-cli/src/panic.rs

@@ -1,13 +1,13 @@
 #![allow(clippy::unwrap_used)]
-use std::panic::PanicInfo;
+use std::panic::PanicHookInfo;
 
 pub fn add_handler() {
-    std::panic::set_hook(Box::new(move |info: &PanicInfo<'_>| {
+    std::panic::set_hook(Box::new(move |info: &PanicHookInfo<'_>| {
         print_compiler_bug_message(info)
     }));
 }
 
-fn print_compiler_bug_message(info: &PanicInfo<'_>) {
+fn print_compiler_bug_message(info: &PanicHookInfo<'_>) {
     let message = match (
         info.payload().downcast_ref::<&str>(),
         info.payload().downcast_ref::<String>(),

flake.nix

@@ -2,9 +2,17 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     systems.url = "github:nix-systems/default";
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    rust-manifest = {
+      url = "https://static.rust-lang.org/dist/channel-rust-1.81.0.toml";
+      flake = false;
+    };
   };
 
-  outputs = inputs@{ nixpkgs, flake-parts, systems, ... }:
+  outputs = inputs@{ nixpkgs, flake-parts, systems, fenix, rust-manifest, ... }:
     let
       expressions = import ./nix;
     in
@@ -20,9 +28,16 @@
         ./nix/flake-builders.nix
       ];
 
-      perSystem = { self', pkgs, lib, ... }:
+      perSystem = { self', pkgs, lib, system, ... }:
         let
-          glistix = pkgs.callPackage expressions.glistix { };
+          rust-toolchain = (fenix.packages.${system}.fromManifestFile rust-manifest).defaultToolchain;
+
+          rustPlatform = pkgs.makeRustPlatform {
+            cargo = rust-toolchain;
+            rustc = rust-toolchain;
+          };
+
+          glistix = pkgs.callPackage expressions.glistix { inherit rustPlatform; };
         in
         {
           formatter = pkgs.nixpkgs-fmt;