Bring back foreach int indexes

[harakim]

https://forum.dlang.org/post/ssqeqbnesbiostjrnxrf@forum.dlang.org

On Wednesday, 29 November 2023 at 14:56:50 UTC, Steven 
Schveighoffer wrote:
> I don’t know how many times I get caught with size_t indexes 
> but I want them to be int or uint. It’s especially painful in 
> my class that I’m teaching where I don’t want to yet explain 
> why int doesn’t work there and have to introduce casting or use 
> to!int. All for the possibility that I have an array larger 
> than 2 billion elements.
> -Steve

If I can only have one or the other, I would choose to enforce 
the cast. However, that is really annoying and not intuitive for 
newcomers. The strictness is one of the things I really value in 
D but I have also really hated along the way. I remember trying 
to figure out how to cast a mutable variable to immutable for the 
first time. I know it's immutable, just let me cast it! I 
appreciate it now. Even once I fixed it, I didn't know why.

Anyway, I would be interested to see a list of the issues your 
students run into and if there is enough there that D could add a 
--simple or --beginner flag or something that allows you to hang 
yourself on the common beginner issues by just emitting a warning.