Function scope arguments

[bearophile]

Maybe this thread shows the need for some design work, see the 
comments by Hara:

http://d.puremagic.com/issues/show_bug.cgi?id=8695
What's the meaning of "in" function arguments? What are the 
purposes of "scope" for function arguments that contain 
indirections, and how to implement that?

Bye,
bearophile