unexpected TOKEN_PAREN_OPEN in string

[jpotier]

This evals correctly using nix, test.nix:

{ pkgs }:

{
  a = ''TRACKERSE+=$(echo $url | ${pkgs.gnused}/bin/sed 's/ /%20/g;s/!/%21/g;s/"/%22/g;s/#/%23/g;s/\$/%24/g;s/\&/%26/g;s/'\''\''/%27/g;s/(/%28/g;s/)/%29/g;s/\//%2F/g;s/:/%3A/g')'';
}

but alejandra chokes on it:

$ nix fmt test.nix
Checking style in 1 file using 8 threads.


Failed! 1 error found at:
- test.nix: unexpected TOKEN_PAREN_OPEN at 150..192, wanted any of [TOKEN_IDENT]

this is with alejandra-3.0.0 from nixpkgs:

    "nixpkgs": {
      "locked": {
        "lastModified": 1672791794,
        "narHash": "sha256-mqGPpGmwap0Wfsf3o2b6qHJW1w2kk/I6cGCGIU+3t6o=",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "9813adc7f7c0edd738c6bdd8431439688bb0cb3d",
        "type": "github"
      },
      "original": {
        "owner": "NixOS",
        "ref": "nixos-unstable",
        "repo": "nixpkgs",
        "type": "github"
      }
    },