TypeError in case class with member name in back ticks

[jarosmpost]

I receive an compiler error with the following code:

case class Abc(`abc-def`: String, abc: Long)

object Test {
  def main(args: Array[String]): Unit = println(Abc("123", 123L))
}

Scala 2.11.13 produces:

scala.reflect.internal.Types$TypeError: type mismatch;
found : String
required: Long

Scala 2.12.13 produces:

java.lang.ClassCastException:` java.lang.String cannot be cast to java.lang.Long

Work around:
Switch the order of the the members in the case class:

case class Abc(abc: Long, `abc-def`: String)

object Test {
  def main(args: Array[String]): Unit = println(Abc(123L, "123"))
}

[SethTisue]

duplicate of #8831?

[som-snytt]

Like the man says.

I was gonna add that it's too bad REPL prints:

Abc(123,123)

instead of

Abc("123", 123L)

Compiler messaging should add, "Thank-you for using L for Long!"

[jarosmpost]

This is a duplicate of #8831

That seems like a bug of the harder kind. Is there a chance that the fix in 2.13 will be ported back to 2.11 and 2.12 or do I have to live with the work around?

[Jasper-M]

Backporting to 2.12.x might make sense. Let's give it a shot scala/scala#9607

[SethTisue]

(And we no longer do 2.11.x releases.)