[Ruby] Add lambda operator to the list of builtin functions

[joseramonc]

This is mostly to fix the ligature issue, since -> is currently tokenizing as arithmetic and comparision

Before:

After (ligature works):

[jwortmann]

I assume -> here in Ruby has the same meaning as in Java or => in JavaScript and C#. I think the scope should not be support.function here, because that's meant for built-in function names like e.g. println instead. Here are some alternatives which are currently used in this repository:

• C#: storage.type.function.lambda.cs
• D: storage.type.function.d keyword.declaration.function.lambda.d
• Java: storage.type.function.anonymous.java
• JavaScript: storage.type.function.arrow.js
• Scala: storage.type.function.arrow.lambda.scala

I think the scope name used in D is the most appropriate here and up to date with the scope naming guidelines.

[joseramonc]

Thanks for your feedback, I just changed the scope to match D, however, I'm not sure why tests failed (seems unrelated to this) or is there anything else I need to do regarding adding this lambda operator?

[michaelblyons]

I think the tests are not your fault. See #2328

[wbond]

Yeah, I'm working on getting the CI test runner fixed

[wbond]

If you rebase on master, the CI should be working now.

[joseramonc]

Awesome, just rebased and it's passing now. Thanks!

[wbond]

This is a good first step, but perhaps provide a slightly more detailed example also? I'd recommend perhaps some parameters and a simple function body.

[joseramonc]

Got it, I've pushed a better example for the ->

[wbond]

Thanks!