@Nullable
  public static GrExpression findExpression(GrStatement selectedExpr) {
    if (!(selectedExpr instanceof GrExpression selected)) return null;

    while (selected instanceof GrParenthesizedExpression) selected = ((GrParenthesizedExpression)selected).getOperand();

    return selected;
  }
@Nullable
  public static GrExpression findExpression(GrStatement selectedExpr)