Worst ideas/features in programming languages?

[jmh530]

On Monday, 11 October 2021 at 21:32:52 UTC, 12345swordy wrote:
> [snip]
> Before you ask, No, using string mixin or templates for 
> implementing interfaces  is NOT considered to be a default 
> interface implementation.
> See here: 
> https://github.com/dotnet/csharplang/blob/main/proposals/csharp-8.0/default-interface-methods.md
>
>
> - Alex

Interfaces can have final methods, you just can't overwrite them.