Add >>> operator (new in 2.14)

[kwalrath]

Closes #3455

Staged: https://kw-staging-dartlang-2.web.app/guides/language/language-tour

[parlough]

This all looks great and makes sense to me :)

I'm not sure all users will understand exactly what >>> does from just the examples, but the other bitwise operators are lacking similar details as well. Perhaps that's a location for improvement in the future or a separate tutorial/article.

[kwalrath]

I'm not sure all users will understand exactly what >>> does from just the examples, but the other bitwise operators are lacking similar details as well. Perhaps that's a location for improvement in the future or a separate tutorial/article.

Yeah, I went with the same minimalism as before. I tried to come up with a better example, but we figured that >>> (and possibly all bitwise operators) is something most people don't need, and if they do need it, they already know how to use it. So I concentrated on having a working test and putting in the words people might search for.

[kwalrath]

I think the build break for stable tests is due to requiring 2.14 (for >>>). Also, once a stable 2.14 is available, I should change examples/misc/pubspec.yaml to have 2.14.0 instead of 2.14.0-0.

[kwalrath]

@lrhn or @mit-mit is this good to go once the feature's in a stable release?

[lrhn]

I'd say so, yes. LGTM.

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[parlough]

@googlebot I consent.

[parlough]

I rebased to fix the stable build but it seems updating the constraint to 2.14.0 didn't fit the constraint of the beta build.

We can either keep 2.14.0-0 (which I did for now) or temporarily disable the beta analysis job.

Edit: Now that 2.14.1 has been released to the beta channel as well, this can be switched back to simply 2.14.0 :)

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[parlough]

When I was taking another look before I merged this in, but I noticed we have a section on compound assignment operators, and it seems >>>= is valid. Do we want to add it to that section as well?

[mit-mit]

I asked @lrhn, and it sounds like we should indeed be listing >>>= in the table here:
https://kw-staging-dartlang-2.web.app/guides/language/language-tour#assignment-operators

[kwalrath]

I'll add >>>= a little later.