scope variable values assigned to non-scope this.placeholder

[vit]

On Monday, 6 August 2018 at 20:29:29 UTC, Alexandru Ermicioi 
wrote:
> Hi Dlang community!
>
> I've been playing with dip1000 and scope storage class and 
> stumbled upon a strange error that I can't to understand yet. 
> Here is minimized version of code that generates the error:
>
> [...]

Parameter values must be `return scope` and this need to be in 
compiler: https://issues.dlang.org/show_bug.cgi?id=19097