code: def make_dep_graph(depender):
  	
  	shutit_global.shutit_global_object.yield_to_draw()
  	digraph = ''
  	for dependee_id in depender.depends_on:
  		digraph = (digraph + '"' + depender.module_id + '"->"' + dependee_id + '";\n')
  	return digraph
docs: Returns a digraph string fragment based on the passed-in module