On Fri, 16 Jan 2009 20:30:53 +1300, Qian Xu <quian.xu at stud.tu-ilmenau.de> wrote: > When shall I use some_var.dup and when not? > Is there any guidlines? > > --Qian Yeah when you want one to be different than the other. If the lvalue is a slice then there is no need though.