export macro symbol with @ failed

[nalaginrut]

hi all, I got a problem with @.
It's OK when I export procedure with @:
==============
(define aaa (@ (rnrs) make-bytevector))
==============

but it'd failed if exported a macro.  
============================
scheme@(guile-user)> (define aaa (@ (rnrs) unless))
While compiling expression:
ERROR: Syntax error:
unknown location: source expression failed to match any pattern in form
unless
============================

is it a bug?

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