There's been a lot of criticism of Arc, much of it saying "he hasn't done anything really new, all this stuff has been done in Lisp dialects before!" But I think it was probably a good idea to explicitly not be a Scheme, so Arc can grow in non-Schemey directions.
I dunno what PLT Scheme's like, but I hear good things about it :-) Arc looks cool, but it's very much a version 0 at the moment.
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There's been a lot of criticism of Arc, much of it saying "he hasn't done anything really new, all this stuff has been done in Lisp dialects before!" But I think it was probably a good idea to explicitly not be a Scheme, so Arc can grow in non-Schemey directions.
I dunno what PLT Scheme's like, but I hear good things about it :-) Arc looks cool, but it's very much a version 0 at the moment.