@Nullable
  protected String getPrefix(@NotNull GrMethodCall methodCall, @NotNull Options options) {
    if (isImplicitlyBoolean(methodCall)) {
      return "";
    }
    else if (options.useDoubleNegation()) {
      return DOUBLE_NEGATION;
    }
    else {
      return null;
    }
  }
@Nullable
  protected String getPrefix(@NotNull GrMethodCall methodCall, @NotNull Options options)