scala> class A
defined class A

scala> object A // warn
defined object A
warning: previously defined class A is not a companion to object A.
Companions must be defined together; you may wish to use :paste mode for this.

scala> trait B
defined trait B

scala> object B // warn
defined object B
warning: previously defined trait B is not a companion to object B.
Companions must be defined together; you may wish to use :paste mode for this.

scala> object C
defined object C

scala> object Bippy
defined object Bippy

scala> class C // warn
defined class C
warning: previously defined object C is not a companion to class C.
Companions must be defined together; you may wish to use :paste mode for this.

scala> class D
defined class D

scala> def D = 0 // no warn
D: Int

scala> val D = 0 // no warn
D: Int = 0

scala> object E
defined object E

scala> var E = 0 // no warn
E: Int = 0

scala> object F
defined object F

scala> type F = Int // no warn
defined type alias F

scala> :power
Power mode enabled. :phase is at typer.
import scala.tools.nsc._, intp.global._, definitions._
Try :help or completions for vals._ and power._

scala> object lookup {
  import intp._
  def apply(name: String): Symbol       = types(name) orElse terms(name)
  def types(name: String): Symbol       = replScope lookup (TypeName(name)) orElse getClassIfDefined(name)
  def terms(name: String): Symbol       = replScope lookup (TermName(name)) orElse getModuleIfDefined(name)
  def types[T: global.TypeTag] : Symbol = typeOf[T].typeSymbol
  def terms[T: global.TypeTag] : Symbol = typeOf[T].termSymbol
  def apply[T: global.TypeTag] : Symbol = typeOf[T].typeSymbol
}
defined object lookup

scala> lookup("F") // this now works as a result of changing .typeSymbol to .typeSymbolDirect in IMain#Request#definedSymbols
res0: $r.intp.global.Symbol = type F

scala> :quit