Please be more careful when changing the language behavior

[Stefan Koch]

On Monday, 1 June 2020 at 19:38:30 UTC, Johan wrote:
> Hi all,
>   Please be more careful when changing the language behavior.
>
> The change made by https://github.com/dlang/dmd/pull/9289 
> silently breaks code in ways that can be very hard to detect. 
> We were lucky to detect one case. There is no 
> warning/deprecation whatsoever to warn me about any other 
> potential breakages in a heavily templated 400kloc codebase 
> with 212 instances of alias this.
>
> The breakage introduced was very obvious, and warning about it 
> is not difficult either. We need to raise the bar for accepting 
> changes like this. The code on buildkite project tester is 
> (fortunately) not the only D code in the world.
>
> Again, please be more careful when changing language behavior.
>
> Thanks,
>   Johan

Wholeheartedly agree!