difficulty with rectangular arrays

[jfondren]

On Friday, 11 June 2021 at 08:30:29 UTC, Moth wrote:
> ```
> class ExampleClass
> {
>     double[6][3] matrix = 0; //fails to compile - "Error: 
> cannot implicitly convert expression `0` of type `int` to 
> `double[6][3]`"
> }
> ```
>
> evidently i'm doing something wrong here, but i can't 
> understand what or why. what's going on? have i misread the 
> spec?

The example in the spec is in a function body and you've copied
it to a class body, where the writeln() would also be in error.
I find https://dlang.org/spec/grammar.html quite hard to read
but I imagine there's a state/declaration distinction there, 
despite
the code looking the same.

This works:

```d
class Example {
     double[6][3] matrix;
     this() {
         matrix = 0;
     }
}
```