treefmt v2.5.0ERRO formatter | nixfmt: failed to apply with options '[]': exit status 1

Error[E001]: expected ';', found '.'
   ┌─ docs/demo/flake.nix:7:22
   │
 6 │     let
 7 │       pkgs = nixpkgs.legacyPackages.@system@;
   │                      ^^^^^^^^^^^^^^
 8 │       mk = name: script: pkgs.runCommand name { nonce = "@nonce@"; } script;
   = note: missing semicolon after definition
   = help: add a semicolon at the end of the previous line


traversed 52 files
emitted 39 files for processing
formatted 33 files (0 changed) in 131ms
Error: failed to finalise formatting: formatting failures detected