snippet:
  exec:
    custom:
      nix:
        filename: "snippet.nix"

        # A prefix that indicates a line that starts with it should not be visible but should be executed if the
        # snippet is marked with `+exec`.
        hidden_line_prefix: "/// "

        # A list of commands that will be ran one by one in the same directory as the snippet is in.
        commands:
          - ["nix-instantiate", "--eval", "--strict" ,"$pwd/snippet.nix"]