Is underscore really considered an upper-case letter?

[Alexey Romanov]

http://www.scala-lang.org/files/archive/spec/2.11/01-lexical-syntax.html says

"Letters, which include lower case letters (Ll), upper case letters (Lu), titlecase letters (Lt), other letters (Lo), letter numerals (Nl) and the two characters \u0024 ‘$’ and \u005F ‘_’, which both count as upper case letters."

However, so far as I know, the only difference between lower and upper case in identifiers in Scala is their behavior in pattern matching, and

0 { case __ => __ }

returns 0, just like

0 { case aa => aa }

while

0 { case AA => AA }

doesn't compile. Should the above quote be modified? ($$ does behave like AA).

[Daniel Armak]

Also:

scala> java.lang.Character.isUpperCase('_')
res1: Boolean = false

scala> java.lang.Character.isLowerCase('_')
res2: Boolean = false

IIUC Unicode defines case only for some scripts, not for all characters.

​

Daniel Armak

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[som-snytt]

Previously,

https://groups.google.com/d/msg/scala-internals/IWJHuWiDbdM/9EcKXxMmmxUJ