Guile Goblins script with Nix shebang

greeter.scm

#!/usr/bin/env nix-shell
#! nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/refs/heads/nixos-unstable-small.tar.gz
#! nix-shell -p guile guile-fibers guile-gnutls guile-goblins
#! nix-shell -i "guile --no-auto-compile -s"
!#

(use-modules (goblins)
             (goblins actor-lib methods))

(define a-vat (spawn-vat))

(define-actor (^greeter bcom our-name)
  (methods
    [(greet your-name)
     (format #t "Hello ~a, my name is ~a!\n" your-name our-name)]
    [(rename new-name)
     (bcom (^greeter bcom new-name))]))

(call-with-vat a-vat
  (lambda ()
    (let ([alice (spawn ^greeter "Alice")])
      ($ alice 'greet "Sundeep")
      ($ alice 'rename "Anton")
      ($ alice 'greet "Sundeep"))))