Global variables and declarative modules

Suppose we have module a that defines a global variable:

---

(define-module (a))

(export my-global-var)

(define my-global-var #f)

---

and module b that uses the global variable and changes it:

---

(define-module (b))

(use-modules (a))

(define (my-proc)

     (set! my-global-var 100)

     (display my-global-variable))

---

Is it so that module a can't be marked declarative?

      - Tommi Höynälänmaa

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