#lang racket/base
;; Define a module
(require
 (for-syntax
  racket/base))

;; Use require/expose (when doesn't seem to matter)
(begin-for-syntax
  (require (only-in rackunit require/expose))
  (require/expose racket/base (cons)))

;; Define a macro that uses a phase-1 definition.
;; Doesn't seem to matter what the macro does, or if it is even used.
(define-syntax (m syn)
  (syntax-case syn ()
    [(_) (do-something-at-phase-1) #'(void)]))

;; Define that definition *after* defining the macro. (order seems to be critical here).
;; Doesn't seem to matter whether the definition is a function or a constant.
(begin-for-syntax
  (define (do-something-at-phase-1) (displayln "meow")))

;; Import the module.
;; Doesn't matter if the macro is used in the module.
(module+ test
  (require (submod "..")))

;; Get the following error, in DrRacket, but not on the commandline or in emacs-mode
#|
 require: namespace mismatch;
 reference to a module that is not available
  reference phase: 1
  referenced module: 'expanded module
  referenced phase level: 1 in: do-something-at-phase-1
|#

;; this line not required to reproduce;
(m)