private static PsiVariable assignedToVariable(PsiMethodCallExpression expression) {
      final PsiElement parent = PsiTreeUtil.skipParentsOfType(expression, PsiParenthesizedExpression.class);
      if (parent instanceof PsiVariable) {
        return (PsiVariable)parent;
      }
      if (!(parent instanceof PsiAssignmentExpression assignmentExpression)) {
        return null;
      }
      final PsiExpression rhs = assignmentExpression.getRExpression();
      if (!PsiTreeUtil.isAncestor(rhs, expression, false)) {
        return null;
      }
      final PsiExpression lhs = PsiUtil.skipParenthesizedExprDown(assignmentExpression.getLExpression());
      if (!(lhs instanceof PsiReferenceExpression referenceExpression)) {
        return null;
      }
      final PsiElement target = referenceExpression.resolve();
      if (!(target instanceof PsiVariable)) {
        return null;
      }
      return (PsiVariable)target;
    }
private static PsiVariable assignedToVariable(PsiMethodCallExpression expression)