Cannot use std.array.Appender in recursive types

[Nordlöw via Digitalmars-d-learn]

On Wednesday, 9 August 2017 at 19:00:54 UTC, Steven Schveighoffer 
wrote:
> If I change the definition of ElementType to use R.init.front 
> instead of R.init.front.init, it compiles. But I'm pretty sure 
> this will break other ranges.

If Phobos compiles with the change would that change deserve a PR?