DMD compiler - warning of unused variables

[DLearner via Digitalmars-d-learn]

Hi

Please see code below:
```
void main() {
   import std.stdio;

   size_t i;
   size_t j;

   i = 5;

   writeln("i = ",i);

}

```

Is there a compiler option that would warn that variable 'j' is 
defined but not used?

Best regards