Array as an argument, ambiguous behaviour.

[Cooler]

> Yes, that is how slices work in D. The following article 
> explains the "non-determinism" that you mention:
>
>   http://dlang.org/d-array-article.html
>
> Ali

Thank you for the article.
Quotation from the article "It is a good idea to note in the 
documentation how the passed in slice might or might not be 
overwritten."
May be just prohibit at language level the case of fun3() 
function, to do not allow unpredictable behavior?