[plt-scheme] MzLib's unitsig.ss

--- Taylor Campbell <campbell at evdev.ath.cx> wrote:
> Is it possible to use macros in a unit/sig?

Units are run-time values.  Macros are expansion-time
values.  Expansion-time occurs before run-time; hence
units cannot export (or import) macros.  However units
can use macros defined in the enclosing module.

E.g.:

(module eg mzscheme

  (require (lib "unitsig.ss")))

  (define-syntax my-macro ...)

  (define my-unit@
    (unit/sig ...

       (my-macro ...)))
 )

HTH,
Noel

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