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

scala> import scala.language.experimental.macros
import scala.language.experimental.macros

scala> import scala.reflect.macros.BlackboxMacro
import scala.reflect.macros.BlackboxMacro

scala> trait Bar extends BlackboxMacro { def impl = { import c.universe._; c.Expr[Unit](q"()") } };def bar = macro Bar.impl
defined trait Bar
defined term macro bar: Unit

scala> bar

scala> trait Foo extends BlackboxMacro { def impl = { import c.universe._; c.Expr[Unit](q"()") } }
defined trait Foo

scala> def foo = macro Foo.impl
defined term macro foo: Unit

scala> foo

scala>