REPL: output lines order doesn't match input definitions order

[unkarjedy]

Minimized code

1. open dotty REPL e.g. in dotty-example-project via sbt console
2. paste following multiline content

sealed trait T1
case class X() extends T1
case class Y() extends T1
case object O extends T1

Output

// defined case class Y
// defined case object O
// defined trait T1
// defined case class X

Expectation

// defined trait T1
// defined case class X
// defined case class Y
// defined case object O

[unkarjedy]

https://youtrack.jetbrains.com/issue/SCL-17300
#5545

[odersky]

Is there a requirement that the order matches?

[unkarjedy]

Hm, actually I'm not aware of such requirement in any specification.
(neither I am aware of any requirement to provide some meaningful output at all 😊)
That's just a thing that used to work in Scala 2 (11, 12, 13).
In Scala Plugin Worksheets we use Scala / Dotty REPL under the hood, and with the current Dotty REPL implementation the output looks quite weird:

Some more details: https://youtrack.jetbrains.com/issue/SCL-17300#focus=streamItem-27-4064653.0-0
It's not something critical, just visually unsatisfying.

If a "feature"/"task" or any other tag is more appropriate here, please feel free to change it.