language IMP, "plain" the implementation with explicit passing of state.
The semantics of the IMP-language is presented in the book:
"The Formal Semantics of Programming Languages" by Glynn Winskel
(1993, The MIT Press).
for more details on monads, see Philip Wadler's page on:
http://cm.bell-labs.com/cm/cs/who/wadler/topics/monads.html#combining-monads
Author: Markus Mottl <markus.mottl@gmail.com>
WWW: http://www.ocaml.info/home/ocaml_sources.html
PR: ports/102103
Submitted by: Stanislav Sedov <ssedov@mbsd.msk.ru>
Approved by: krion (mentor)
