Toughts on alias this. (implict converstion in general)

[12345swordy]

As I am working on the tuple dip and porting Timon Gehr work, I 
noticed that there is a section on alias this which got me 
thinking. I really don't want the ability to alias this the tuple 
itself as that could cause problems in the future. It seems that 
Walter share the same negative sentiment regarding alias this. We 
could introduce implicit constructors for structs/classes for 
rvalues and implicitOP for lvalues by having structs copy it and 
having classes GC allocate it. That way we could introduce 
implicit conversion without having the rest of the baggage that 
alias this introduce.(Credit for manu for coming up the idea). Of 
course this is all opt-in from the developer side to prevent 
unintentional function design.


- Alex