The regression was introduced here: https://github.com/python/cpython/commit/e023091815e4946e42c1af102be1f258b2f47cb8

in main() it prints " ".join(sys.argv[1:]) instead of " ".join(args).  

In do_run (line 1029) sys.argv gets updated with the arg for that particular "run" command:   sys.argv = shlex.split(arg)

The quickest fix would be to change main back to print sys.argv rather than arg. But I'm a little uneasy with a program modifying sys.argv (I wouldn't do it). So I'm wondering if that should be changed. What do you think?