Changing the behavior of the comma operator

[ixid]

> I think this should not be done. Note that even though code 
> which is D could reintroduce commas safely, C code will still 
> exist at that time, and likely need porting to D. The principle 
> that C code should either do the same thing, or not compile, 
> would be violated.

What would be an example of C code that would compile in a D
where the comma operator was used for tuples? Also why is cut and
pasting C code to D so important? If it's non-trivial surely
people will just use extern C. If it's trivial they can make the
minor improvements necessary.