I'm working on a #%module-begin variant that provides all module-level
bindings, and I'm having trouble finding the right way to give lexical
context to all-defined-out.

The issue (IIUC) is that all-defined-out only exports identifiers "that
have the same lexical context as the (all-defined-out) form"; however, I
want to have #%module-begin introduce all-defined-out, but have it export
the identifiers defined by the programmer in the body of the module.

Currently what I'm doing is essentially this:

#lang racket

(module lang racket
  (provide (except-out (all-from-out racket)
                       ;all-defined-out ;can't omit this
           (rename-out [providing-module-begin
  (require (for-syntax syntax/parse))
  (define-syntax (providing-module-begin stx)
    (syntax-parse stx
      [(_ body:expr ...)
          (provide #,(datum->syntax stx '(all-defined-out)))
          body ...)])))

(module demo (submod ".." lang)
  (define something
    "a value"))

(require (submod "." demo))


This almost works — the providing happens correctly — but it requires that
the lang module provide all-defined-out, which I don't actually want to be
otherwise available.

Is there a way to give all-defined-out the lexical context I'm looking for?

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