-preview=in might break code

[Iain Buclaw]

On Sunday, 4 October 2020 at 14:58:13 UTC, Iain Buclaw wrote:
>
> void fun2(in long[16] a, int b);
> fun2(var, var[0]);
> ```
>
> In the above, all parameters are passed in memory as per ABI 
> requirements.

(Except the `int`/`var[0]` parameter that I added in last minute 
;-)