@yebblies: I'm sure you'll have problems with the trailing // comment due to DDMD, although in this case it does document intention.

Anyway, maybe move it above the `else if` and rewrite it to:

```D
/* Only warn about errors in 'root' modules.
nogcUnittest: only warn in unittests if requested */
else if (global.params.vgc && getModule() && getModule()->isRoot()
```