@Nullable
  private static PsiAssignmentExpression findAssignment(@NotNull PsiLocalVariable variable) {
    return findOccurrence(variable.getParent(), variable,
                          PsiTreeUtil::skipWhitespacesAndCommentsForward,
                          JoinDeclarationAndAssignmentJavaInspection::findAssignment);
  }
@Nullable
  private static PsiAssignmentExpression findAssignment(@NotNull PsiLocalVariable variable)