/// <param name="e">
/// is the plus expression. </param>
/// <returns> new add expression </returns>
public virtual object visit(PlusExpr e)
{
e.arg().accept(this);
return(null);
}
/// <param name="e">
/// is the plus expression. </param>
/// <returns> new add expression </returns>
public virtual object visit(PlusExpr e)
{
AddExpr ae = new AddExpr(make_int_lit(0), e.arg());
return(ae.accept(this));
}
