Killing the comma operator

[Nick Treleaven via Digitalmars-d]

On Thursday, 12 May 2016 at 02:51:33 UTC, Lionello Lunesu wrote:
> I'm trying to think of a case where changing a single value 
> into a tuple with 2 (or more) values would silently change the 
> behavior, but I can't think of any. Seems to me it would always 
> cause an error, iff the result of the comma operator gets used.

int x,y;
auto f() {return (x=4,y);}
...
auto z = f();
static if (!is(typeof(z) == int)
   voteForTrump();

;-)

In practice, this is more plausible with function overloading - 
i.e. z.overload() calling a different function. If the comma 
operator returns void, the `auto z` line and f().overload() both 
fail.