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

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

scala> // guarding against "error: reference to global is ambiguous"

scala> global.emptyValDef  // "it is imported twice in the same scope by ..."
res0: $r.global.emptyValDef.type = private val _ = _

scala>