see also: scala/docs.scala-lang#1464

Here is a branch https://github.com/som-snytt/scala/tree/review/binary-literals and commit som-snytt@d385d95 showing the small delta atop my other PR.

I also checked

scala> 0b1000100010001000_1000100010001000_1
       ^
       error: integer number too large

scala> 0b1000100010001000_1000100010001000_1000100010001000_1000100010001000L
res0: Long = -8608480567731124088

scala> 0b1000100010001000_1000100010001000_1000100010001000_1000100010001000_0L
       ^
       error: integer number too large

Maybe I'll take a few minutes this week to understand the overflow check.

I was curious if there's an internal limit, but it's commented out:

    protected def putChar(c: Char): Unit = {
//      assert(cbuf.size < 10000, cbuf)
      cbuf.append(c)
    }

where cbuf is a StringBuilder not an array.

Hmm, looks like this hasn't got much interest. I sent a bump in https://contributors.scala-lang.org/t/pre-sip-support-binary-integer-literals/3559/5 to see if anyone in the SIP committee wants to champion it, otherwise it should probably be closed as a Pre-SIP that didn't rally a champion.

Published: https://docs.scala-lang.org/sips/binary-integer-literals.html

Thanks for publishing this Dale!

Merging this would obligate the initial Scala 3.0 release to also support it, and Martin was adamant that the 3.0 plate is already full (reference: scala/docs.scala-lang#1639).

There are starting to be more and more situations where a change needs to land first in Dotty, then be considered for a possible backport to Scala 2, and it seems this is one of them.

On a positive note, the linked minutes also mention that a broader Dotty proposal around numeric literals more generally might open the door for this.

I might open a PR against Dotty if I get the time; if that happens, I will link it here.

Scala is the only place where binaries must agitate for inclusion.

for PRs that are unable to progress in 2.13.x, we are closing them but leaving them on the 2.14.0-M1 milestone so we can find them later

for context on this, see scala/scala-dev#661