From lliao@ren.eecis.udel.edu Sat Oct 12 14:37:29 2002
Date: Sat, 12 Oct 2002 14:31:00 -0400 (EDT)
From: Li Liao <lliao@ren.eecis.udel.edu>
To: Hyunok Park <hpark@udel.edu>
Subject: Re: question for hw2



...

>
> Is this related to my interp function where I initialize valuestack
> and dictstack as empty?

Your initial state ([], []) is not right. The dictionary stack cannot be
empty; it must have at least one dictionary, even if that dictionary
may be empty (and it should be empty at the beginning)

....