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

scala> import scala.reflect.macros.blackbox.Context
import scala.reflect.macros.blackbox.Context

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

scala> bar

scala> class Foo(val c: Context) { def impl = { import c.universe._; c.Expr[Unit](q"()") } }
defined class Foo

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

scala> foo

scala> :quit