What's the purpose of the 'in' keyword ?

[Q. Schroll]

On Sunday, 27 May 2018 at 16:00:15 UTC, Jonathan M Davis wrote:
> [...]
> Honestly, I'd suggest that folks never use in at this point.
> There's zero benefit to it.
> [...]

Exactly. If you intend const, just write const. If you intend 
const scope, write const scope.