$ copy-file changes/MacroRuntimeCompileError.scala MacroRuntime.scala
> clean
> compile

$ copy-file changes/MacroRuntimeRuntimeError.scala MacroRuntime.scala
> clean
> compile

$ copy-file changes/Main.scala Main.scala
$ copy-file changes/MacroRuntime.scala MacroRuntime.scala
> clean
> run

# use an implemntation of the macro that emits a compile time error
$ copy-file changes/MacroRuntimeCompileError.scala MacroRuntime.scala
-> compile

$ copy-file changes/MacroRuntime.scala MacroRuntime.scala
> clean
> compile

$ copy-file changes/MacroRuntimeRuntimeError.scala MacroRuntime.scala
-> run
