@Override
  public void visitAssignmentExpression(@NotNull PsiAssignmentExpression assignment) {
    super.visitAssignmentExpression(assignment);
    final PsiExpression arg = assignment.getRExpression();
    if (VariableAccessUtils.mayEvaluateToVariable(arg, variable)) {
      assignedFrom = true;
      stopWalking();
    }
  }
@Override
  public void visitAssignmentExpression(@NotNull PsiAssignmentExpression assignment)