When activate Organize Imports is called round brackets are inserted.

import scala.collection.mutable.ListBuffer

object S

object Class {

  ("//")
  ("//")
}

The brackets are inserted after the closing Bracket. One bracket for every line of ("//")

This is about as minimized as I can get it. In particular:

• The string must contain the string "//"
• The string must be surrounded by parentheses
• A top level class definition is required before the occurrence of the string