@Nullable
  @Override
  public TypeConversionDescriptorBase findConversion(PsiType from,
                                                     PsiType to,
                                                     PsiMember member,
                                                     PsiExpression context,
                                                     TypeMigrationLabeler labeler) {
    if (BaseGuavaTypeConversionRule.canConvert(from,
                                               to,
                                               CommonClassNames.JAVA_LANG_ITERABLE,
                                               StreamApiConstants.JAVA_UTIL_STREAM_STREAM)) {
      return new GuavaTypeConversionDescriptor("$it$", "$it$", context).setConvertParameterAsLambda(false);
    }
    return null;
  }
@Nullable
  @Override
  public TypeConversionDescriptorBase findConversion(PsiType from,
                                                     PsiType to,
                                                     PsiMember member,
                                                     PsiExpression context,
                                                     TypeMigrationLabeler labeler)