Support binary integer literals using 0b, as in Java

[som-snytt]

Support binary integer literals. For example:

scala> 0b00101010
val res0: Int = 42

This language change was approved by the SIP (Scala Improvement Process) committee: SIP 42, https://docs.scala-lang.org/sips/binary-integer-literals.html

revival of #8275

[Sporarum]

Suggested change

binaryDigit ::= ‘0’ | ‘1’

Since there is no reminder of hexDigit, there probably shouldn't be one for binaryDigit

[som-snytt]

I noticed digit was removed (because it's a char class?); and hexDigit was promoted to earlier section because of unicode escape. But maybe the rule of thumb should be "this is obvious so defer to the summary" as opposed to "chapter summary should be complete".

[Sporarum]

I think that is a good rule of thumb

[som-snytt]

thanks, I took both edits. The earlier hexdigit might be unnecessary, but the context is (TIL):

scala> val `\u0061\u0062\u0063` = 42
val abc: Int = 42

[Sporarum]

Yeah I learned that as well a couple days ago, it's a cool feature in case you are restricted to ASCII, but still need to access some unicode-named methods

[lrytz]

LGTM

[som-snytt]

I was too lazy to change the assert to existing check_success, and also too lazy to rename check_success to success ✔️ using unicode.

Also, I wanted to avoid merge commit for trivial one-commit PR, but I'm not actually sure what the github button does. On dotty, they complained about losing merged commit messages in the plural case. Maybe unallowed rebase button is what preserves your commit?

[som-snytt]

So the text undefined in the UI is actually the text. How annoying! It should say, "This space intentionally left blank."

As it warns, the "author" was me; well, Foucault already told us that label is without stable meaning. Undoubtedly, I don't have a display name configured.

Having the PR number in the comment header is handy; usually one must click thru to the commit to find where github displays the associated PR.

Dotty must be using rebase and merge.

commit e59b420e8a7aed7e63de316a88be42f291bc3aac (HEAD -> test/current, upstream/2.13.x)
Author: som-snytt <som.snytt@gmail.com>
Date:   Thu Jan 11 13:37:44 2024 -0800

    SIP 42 Binary literals finds acceptance (#10656)

    undefined

[SethTisue]

FYI and thanks @NthPortal