The problem was a little bit more than stated above.
First, the Devel::REPL::Plugin::ReadLineHistory was
loading and running. There were two problems:
(1) the plugin only supported TR::Gnu
(2) exit kills the shell before the WriteHistory is run
as a result, I thought it was not working for me.
I've just uploaded a new version of the ReadLineHistory
plugin which, I believe, fully supports both
Term::ReadLine::Gnu and Term::ReadLine::Perl.
The plugin appears to work for win32 (TR::Perl) and
cygwin (TR::Perl and TR::Gnu).
The "death by exit" problem has been posted in
another bug ticket. The initial work-around is
planned to implement some sort of command for
quitting the shell that can replace exit for our
interactive use.
--Chris