Syntax error with Enums

[allanrenucci]

This fails to compile

enum Foo {
  case Bar
  private case Bat
}

-- [E039] Syntax Error: <console>:3:2 ------------------------------------------
3 |  private case Bat
  |  ^^^^^^^
  |  ';' expected, but 'private' found

It can be reproduced with any modifier.

[biboudis]

Thanks @allanrenucci. Modifiers are currently not supported with Enums.

Enums are discussed here.

I am marking it as a bug as the error needs to be adjusted.

[allanrenucci]

Note that dotc is fine with both

enum Foo {
  case Bar;
  private case Bat
}

and

enum Foo {
  private case Bar
} 

So the reported error is not the only issue here. There is something wrong with the parser

[nicolasstucki]

Is it actually making Bar/Bat private? or is the modifier ignored.
What is the use case for a private enum?

[allanrenucci]

This is what I get in the repl

scala> enum Foo { case Bar; private case Bat } 
defined class Foo
defined module Foo
scala> Foo.Bar 
val res1: Foo = Bar
scala> Foo.Bat 
-- Error: <console>:6:4 --------------------------------------------------------
6 |Foo.Bat
  |^^^^^^^
  |value Bat in object Foo cannot be accessed as a member of Foo.type from module class $iw$.

I used private to showcase the issue. It can be reproduced with any modifier. I can see use cases for annotations (e.g. @deprecated)

[biboudis]

I wonder what happens in the case of pattern matching over mixed enum cases.

ping @odersky