Warning: explicit element-wise assignment (this.vector)[] = vec.vector[cast(ulong)0..cast(ulong)dimension]

[bearophile]

David:

> Why does dmd produce this warning? (this is new in 2.063) Why is
> assigning elementwise better?

The short answer is: do as the compiler suggests you, and be very 
happy the compiler avoids you some bugs.

The explanation is longer. In brief, it's much better to avoid 
some bugs and to make the D semantics more clear, to denote all 
vector ops, including the assignment with a [].

Bye,
bearophile