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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
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