code: def insert_completions(self, e): # (M-*)
          u
          completions = self._get_completions()
          b = self.begidx
          e = self.endidx
          for comp in completions:
              rep = [ c for c in comp ]
              rep.append(' ')
              self.l_buffer[b:e] = rep
              b += len(rep)
              e = b
          self.line_cursor = b    
          self.finalize()
docs: u"""Insert all completions of the text before point that would have
          been generated by possible-completions.