why $ is need to access array [negative index]?

[mw]

On Friday, 18 September 2020 at 21:14:19 UTC, mw wrote:
> On Friday, 18 September 2020 at 21:11:58 UTC, Steven 
> Schveighoffer wrote:
>> Well, if you don't care about verbosity.
>>
>> signs[(sign + $) % $] = ...;
>
> I want compiler writes this verbosity, instead of the user :-)

And ... this [(sign + $) % $] is not right, it's defensive 
programming: and will hide real bugs, e.g.

when array index > array.length.

See how easy user code contains bugs. The compiler should really 
do the hard work to make programmer's life easier.