Switch nix-shell to use oxalica overlay to get miri working, fix memory leak in archetypes

lyra-ecs/src/archetype.rs

@@ -19,7 +19,9 @@ impl Drop for ComponentColumn {
 
         unsafe {
             // TODO: trigger drop on the components
-            let layout = self.info.layout();
+            // SAFETY: The size of the data buffer is the capcity times the size of a component
+            let size = self.info.layout().size() * self.capacity;
+            let layout = Layout::from_size_align_unchecked(size, self.info.layout().align());
             dealloc(data, layout);
         }
     }

rust-toolchain.toml

@@ -1,4 +1,4 @@
 [toolchain]
-channel = "nightly"
+channel = "nightly-2023-11-21"
-date = "2023-11-21"
+#date = "2023-11-21"
 targets = [ "x86_64-unknown-linux-gnu" ]

shell.nix

@@ -1,6 +1,10 @@
 let
-  moz_overlay = import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz);
+  rust_overlay = import (builtins.fetchTarball https://github.com/oxalica/rust-overlay/archive/master.tar.gz);
-  nixpkgs = import <nixpkgs> { overlays = [ moz_overlay ]; };
+  nixpkgs = import <nixpkgs> { overlays = [ rust_overlay ]; };
+
+  rust = (nixpkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml).override {
+    extensions = [ "rust-analysis" "rust-src" "miri-preview" ];
+  };
 in
   with nixpkgs;
   stdenv.mkDerivation rec {
@@ -15,13 +19,7 @@ in
       mold
       udev
       lua5_4_compat
-      ((nixpkgs.rustChannelOf { rustToolchain = ./rust-toolchain.toml; }).rust.override {
+      rust
-        extensions = [
-          "rust-src"
-          "rust-analysis"
-          "miri-preview"
-        ];
-      })
     ];
     buildInputs = [
       udev alsa-lib libGL gcc