Problem with a rust build (crane/fenix)

This is probably because you are using the latest profile, switching to default fixes the issue for me

--- a/nix/repo/rust.nix
+++ b/nix/repo/rust.nix
@@ -3,4 +3,4 @@ let
 in
   # export fenix toolchain as it's own package set
   # change "stable" to "latest" for nightly rust
-  builtins.removeAttrs (fenix.packages.latest // {inherit (fenix.packages) rust-analyzer;}) ["withComponents"]
+  builtins.removeAttrs (fenix.packages.default // {inherit (fenix.packages) rust-analyzer;}) ["withComponents"]
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