This is an emulated version of Delimited Continuations suitable for experimenting and testing.
This code is used in the Open Source Project https://github.com/portablesimula and is suitable for that purpose.
It is not tested in other environments. Any help is welcomed in improving it.
This version should be replaced by project LOOM,s code when it becomes available in a future Java release.

More info: https://wiki.openjdk.java.net/display/loom/Main
LOOM source: http://hg.openjdk.java.net/loom/loom/file/c3e1c6edebac/src/java.base/share/classes/java/lang/Continuation.java