code: def add_new_refs(cls, manifest, current_project, node, macros):
          
          manifest = manifest.deepcopy(config=current_project)
          # it's ok for macros to silently override a local project macro name
          manifest.macros.update(macros)
  
          if node.unique_id in manifest.nodes:
              # this should be _impossible_ due to the fact that rpc calls get
              # a unique ID that starts with 'rpc'!
              raise dbt.exceptions.raise_duplicate_resource_name(
                  manifest.nodes[node.unique_id], node
              )
          manifest.nodes[node.unique_id] = node
          cls.process_sources_for_node(manifest, current_project, node)
          cls.process_refs_for_node(manifest, current_project, node)
          cls.process_docs_for_node(manifest, current_project, node)
          return manifest
docs: Given a new node that is not in the manifest, copy the manifest and
          insert the new node into it as if it were part of regular ref
          processing