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can we predict that jruby+truffle, will be usable for ruby gems in the next few years?

Actually, JRuby+Truffle can already install gems using Bundler, although it uses some hacks to work around issues like currently-missing OpenSSL.

Realistic Rails apps will not work yet, but there is fast progress in this area, we started this year with a minimal webserver and now got a simple blog app working with a PostgreSQL adapter.

No, no we can't.

Or at least, I doubt it. You're free to predict whatever you like.

At the very least, I don't think any amb implementations are making their way to jruby any time soon. Although that's not an issue with any real-world code.

What's amb?

amb is a nondeterministic operator. It's a fun toy, although not terribly practical. It's usually implemented in terms of call/cc, a rare (and, as commonly implemented, expensive) function. CRuby implements it, JRuby doesn't.

It's not revelant to my main point, but I thought I'd have a bit of fun.

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