errhandler call has changed
errhandler call convention has changed
errhandler call convention changed
make the default error handler clean up after us, and only restart the REPL thread if an uncaught exception was thrown from the REPL thread
make __arc_reroot a public function
reroot to the root if we have an unhandled exception
kill-thread and break-thread bound
change error handler calling convention
define kill-thread and break-thread
dead, sleep, and atomic-invoke are implemented