d optimization: delegates vs. mixin

[zoli]

bearophile Wrote:

> zoli:
> > Can the compiler optimize the delegates (foo) to form an inline code, or the mixin version is prefered?<
> 
> Today D compilers are in general not smart enough yet (like the Scala compiler, for example) to inline delegates. But there's an alternative to string mixins, in D2 you can pass a templated function, even one where you omit the type of the arguments :-)
> There's no shortage of tricks in D2.

Thank you. Could you provide a sample or a link ? 
Sorry, i know it's a d.learn topic..., 
Offtopic: Is it possible to alter the web interface of the news to change newsgroups during composition ?