if (oldValue != null) {
        throw conflictException("key", e.getKey() + "=" + oldValue, entryArray[i]);
      }
      K oldKey = backwardDelegate.putIfAbsent(e.getValue(), e.getKey());
      if (oldKey != null) {
        throw conflictException("value", oldKey + "=" + e.getValue(), entryArray[i]);
      }
    }
    ImmutableList<Entry<K, V>> entryList = ImmutableList.asImmutableList(entryArray, n);

		}
	}
	return nil
}

func (f *WorkFile) AddReplace(oldPath, oldVers, newPath, newVers string) error {
	return addReplace(f.Syntax, &f.Replace, oldPath, oldVers, newPath, newVers)
}

func (f *WorkFile) DropReplace(oldPath, oldVers string) error {
	for _, r := range f.Replace {
		if r.Old.Path == oldPath && r.Old.Version == oldVers {
			r.Syntax.markRemoved()
			*r = Replace{}
		}
	}
	return nil
}