Pops a directory from the directory stack, and sets the current directory
to it.
# File lib/shell.rb, line 330
def popdir
check_point
notify("popdir")
if pop = @dir_stack.pop
chdir pop
notify "dir stack: [#{@dir_stack.join ', '}]"
self
else
Shell.Fail DirStackEmpty
end
Void.new(self)
end