code: def _nailgunnable_combined_classpath(self):
      
      cp = []
      cp.extend(self.tool_classpath('rsc'))
      # Add zinc's classpath so that it can be invoked from the same nailgun instance.
      cp.extend(super(RscCompile, self).get_zinc_compiler_classpath())
      return cp
docs: Register all of the component tools of the rsc compile task as a "combined" jvm tool.
  
      This allows us to invoke their combined classpath in a single nailgun instance (see #7089 and
      #7092). We still invoke their classpaths separately when not using nailgun, however.