expand-diff

#!/bin/sh
#|
exec racket -qu "$0" ${1+"$@"}
|#
#lang racket

(require (planet stamourv/sexp-diff))

(define (read-and-expand file)
  (with-input-from-string ;; read-syntax won't work with #lang
      (with-output-to-string
        (lambda ()
          (system (format "raco expand ~a" file))))
    read))

(let ((old (vector-ref (current-command-line-arguments) 0))
      (new (vector-ref (current-command-line-arguments) 1)))
  (pretty-print
   (sexp-diff (read-and-expand old)
              (read-and-expand new))))