diff --git a/crates/ide/src/ide/assists/convert_to_inherit.rs b/crates/ide/src/ide/assists/convert_to_inherit.rs
index 47aeb75..ef51ac4 100644
--- a/crates/ide/src/ide/assists/convert_to_inherit.rs
+++ b/crates/ide/src/ide/assists/convert_to_inherit.rs
@@ -15,8 +15,9 @@ pub(super) fn convert_to_inherit(ctx: &mut AssistsCtx<'_>) -> Option<()> {
     }
 
     // RHS should be a single identifier.
-    let ast::Expr::Ref(rhs) = binding.value()?.flatten_paren()? else {
-        return None;
+    let rhs = match binding.value()?.flatten_paren()? {
+        ast::Expr::Ref(rhs) => rhs,
+        _ => return None,
     };
 
     // LHS should be a single static name.
@@ -25,8 +26,9 @@ pub(super) fn convert_to_inherit(ctx: &mut AssistsCtx<'_>) -> Option<()> {
     if attrs.next().is_some() {
         return None;
     }
-    let AttrKind::Static(Some(key)) = AttrKind::of(attr) else {
-        return None;
+    let key = match AttrKind::of(attr) {
+        AttrKind::Static(Some(key)) => key,
+        _ => return None,
     };
 
     // LHS should match RHS.
diff --git a/flake.nix b/flake.nix
index dcbc30e..edb3d32 100644
--- a/flake.nix
+++ b/flake.nix
@@ -58,10 +58,13 @@
           };
 
           devShells.default = pkgs.mkShell {
-            packages = with pkgs; with rustPkgs; [
+            packages = with pkgs; [
               # Override the stable rustfmt.
-              rust-nightly_2022-10-01.availableComponents.rustfmt
-              rust
+              rustPkgs.rust-nightly_2022-10-01.availableComponents.rustfmt
+              # Follows nixpkgs's version of rustc.
+              (let vers = lib.splitVersion rustc.version; in
+                rustPkgs."rust_${lib.elemAt vers 0}_${lib.elemAt vers 1}_${lib.elemAt vers 2}")
+
               nix.out # For generation of builtins.
               gdb
               jq