@Nullable
  private static DfaAnchor getAnchor(PsiExpression rExpression) {
    if (rExpression == null) return null;
    PsiAssignmentExpression expression = tryCast(rExpression.getParent(), PsiAssignmentExpression.class);
    return expression == null ? null : new JavaExpressionAnchor(expression);
  }
@Nullable
  private static DfaAnchor getAnchor(PsiExpression rExpression)