Rather D1 then D2

[0xEAB]

On Saturday, 22 September 2018 at 19:41:16 UTC, JN wrote:
> Some code will break, sure, but it's a mechanical change that 
> should be possible to apply by some tool.

Who will run this tool? Who's gonna merge the PRs created with 
this tool?
Compatibility fixes would have been easy in the past in many 
cases - nevertheless, it needs someone to apply them. Which often 
did not happen in the past, unfortunately.


> Also, with proper dub package validation, it should be easy to 
> assess how many packages actually break if any.

Now that there's the tester by Neia, one will see whether this 
works in practice. Time will tell.