// Macros.scala
object Macros {
  object Shmacros {
    def macro foo(x: Int): Int = x
  }
}

// Test.scala
object Test extends App {
  import Macros.Shmacros._
  println(foo(2))
}

C:\Projects\Kepler\sandbox>myke compile "C:\Projects\Kepler\sandbox\Test.scala"
macroExpand: Macros#12.Shmacros#9529.foo#9531(2)
looking for macro implementation: Macros#13.Shmacros#9528.foo#9531
found implementation at: Macros#13.Shmacros#9528.defmacro$foo#9533
loading implementation class: Macros.Shmacros
classloader is: Cl#1882910486 of type class scala.tools.nsc.util.ScalaClassLoader$URLClassLoader
classpath is: [elided for brevity, contains directory with macro]
implementation class failed to load: java.lang.ClassNotFoundException: Macros.Shmacros
macro is not overridden: Macros#12.Shmacros#9529.foo#9531
C:\Projects\Kepler\sandbox\Test.scala:3: error: macro implementation not found: foo
  println(foo(2))
             ^
one error found