private static boolean isToString(final UExpression expression) {
    final UMethod method = UastUtils.getParentOfType(expression, UMethod.class);
    if (method == null) return false;
    final PsiType returnType = method.getReturnType();
    return TO_STRING.equals(method.getName())
           && method.getUastParameters().isEmpty()
           && returnType != null
           && "java.lang.String".equals(returnType.getCanonicalText());
  }
private static boolean isToString(final UExpression expression)