Hide REPL wrapper prefix in more cases to not over-load users cognitively with internal details

[bjornregnell]

It would be nice if the rs$line$$ prefix below is hidden, as it is an implementation detail of the REPL:

Scala 3.0.0:

scala> object X
// defined object X

scala> Set(X)                                                                                                                               
val res34: Set[X.type] = Set(rs$line$79$X$@787eae84)

scala> X
val res35: X.type = X$@787eae84

Scala 2.13.6:

Welcome to Scala 2.13.6 (OpenJDK 64-Bit Server VM, Java 11.0.11).
Type in expressions for evaluation. Or try :help.

scala> object X
object X

scala> Set(X)
val res0: scala.collection.immutable.Set[X.type] = Set(X$@1da53f4f)

scala> X
val res1: X.type = X$@1da53f4f

See also discussion here: https://gitter.im/scala/contributors?at=60e5e86c110daa37b127ffe5

[bjornregnell]

The (rudimentary) code for stripping that name from the rendered output can be found here (as pointed out by @griggt): https://github.com/lampepfl/dotty/blob/46d0b05917959ebc3609ffae6dd1a2366b5efeff/compiler/src/dotty/tools/repl/Rendering.scala#L122-L123

[bjornregnell]

Related ticket scala/bug#6623