In fact I wonder if anyone has ported pg's Arc macros to Scheme... it seems a lot of the benefit of the language would still be there without a full Arc syntax implementation.
It could be seen as an experiment to see how much an Arc without special language extensions would feel like the real Arc - eg. minus square brackets etc.
My feeling is that merely having nice short abbreviations buys quite a lot - but hell, Ive written mostly C code, so you may rightly cringe at the lobotimization.
