David A. Wheeler scripsit:

> I believe most other Schemes in wide use have R5RS macros.

Indeed.  At least Racket, Gauche, MIT, Gambit, Chicken, Bigloo,
Scheme48/scsh, Guile 2.0, Chibi, Chez, Ikarus/Vicare, Larceny,
Ypsilon, Mosh, IronScheme support them.

> Comments?  Good idea? Bad idea?

Go for it.  The Schemes that don't support syntax-rules probably aren't
going to support readable expressions either.

--
Principles.  You can't say A is         John Cowan <xxxxxx@ccil.org>
made of B or vice versa.  All mass      http://www.ccil.org/~cowan
is interaction.  --Richard Feynman