Make shadowing mixin template names an error (5 years old problem)

[monkyyy]

On Sunday, 21 June 2026 at 18:59:24 UTC, mw wrote:
>

> like 5th place this conversation happened

you'd break things; if you want an automagic singleton and the 
like 3 template options airnt good enough it should be a keyword

templates airnt `@safe classes`, if you want (bad) oo thoeries 
make it work with the oo part of the language