Laws (and I'm considering honor code policies to fall in that category) are not programs. They intentionally have some ambiguity so that humans can interpret the meaning. Here, the intent is clearly that students should not share their work. They need not explicitly forbid all forms that such sharing could take.

"As described in the Student Code, aiding someone else's cheating also constitutes cheating. Leaving your program in plain sight or leaving a computer without logging out, thereby leaving your programs open to copying, may constitute cheating depending upon the circumstances. Consequently, you should always take care to prevent others from copying your programs, as it certainly leaves you open to accusations of cheating."