Type in expressions to have them evaluated.
Type :help for more information.

scala> :power
** Power User mode enabled - BEEP WHIR GYVE **
** :phase has been set to 'typer'.          **
** scala.tools.nsc._ has been imported      **
** global._, definitions._ also imported    **
** Try  :help, :vals, power.<tab>           **

scala> val u = rootMirror.universe
u: $r.intp.global.type = <global>

scala> import u._, scala.reflect.internal.Flags
import u._
import scala.reflect.internal.Flags

scala> class C
defined class C

scala> val sym = u.typeOf[C].typeSymbol
sym: u.Symbol = class C

scala> sym.isContravariant
res0: Boolean = false

scala> sym setFlag Flags.INCONSTRUCTOR
res1: sym.type = class C

scala> sym.isClassLocalToConstructor
res2: Boolean = true

scala> sym.isContravariant // was true
res3: Boolean = false

scala> :quit