# introduces first compile iteration
> compile
# adds a new method to A which will cause transitive invalidation
# of all source files that inherit from it
# also, all direct dependencies of files that inherit from A will
# be invalidated (in our case that's X.scala)
$ copy-file changes/A1.scala src/main/scala/A.scala
# second iteration
> compile
# check in which compile iteration given source file got recompiled
> check-compilations