...must be of type T because arr.length type is T"_.

What's is happening...

and this won't work either:

int i = 2;
//int[10] powersOfTwo = generate!(() => i *= 2...

...they generally do it for size reasons, and don't want to end up with...

...just enjoy having bugs with some implicit size_t, or do everyone just enjoy deprecation...

...is still the length, you just don't know what it is yet.

module m...

...T as the larger type, with a preference for unsigned type if tied in size...

...enum size_t i)
    {
        static if (__traits(isEnum, i) { ... } else { ... }
    }
}
X x;
size_t i...

...d do:

```d
auto opSlice(size_t l, size_t u)(enum : l, enum : u...

...code problem.

Perhaps change this code:
```
        for (size_t i = 0; i < members.length; i...

``_`` is a valid identifier that may point to a length.

So that isn't usable.