DIP 1021--Argument Ownership and Function Calls--Final Review

[12345swordy]

On Monday, 16 September 2019 at 10:06:55 UTC, Walter Bright wrote:
> DIP 1021 can be experimented with as the code is now in the 
> compiler and enabled with -preview=useDIP1021. I'd expect some 
> trouble with it as it doesn't have much wear on the tires.

Which IRC it been implemented couple of days ago. Not very much 
time to kick the tires so to speak.

- Alex