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I am trying to run Carbon in Godbolt.

Printing as in the example from Carbon's Github repository, does not work. 'Print("Test");' gives a complaint about not finding 'Print'.

That is correct. Strings and I/O both have a bunch of work to be done. Printing currently requires workarounds like https://godbolt.org/z/MP4164f7s

Array iteration got checked into the prelude so this is now shorter: https://godbolt.org/z/YYheo19ea

I see. So, it's just a slide-ware bullet point right now? It would be helpful to really emphasize a word like "planned" in that bullet. It might have been lifted from some future-sounding/plan-oriented list and now the material makes it seem like it's actually available.

Is there a compiler, maybe an online one, for Carbon, or some way to compile and run Carbon code? And if not, what are the plans for that?

The nightly release of the Carbon compiler can be used via https://carbon.compiler-explorer.com/ . Note that it is definitely a work in progress, it hasn't even reached our v0.1 goals yet, but a good chunk of important functionality is working.