[Issue 24431] dmd -vcg-ast crashes

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24431

--- Comment #2 from Dāvis <davispuh at gmail.com> ---
I narrowed it down to this:

```
import std.algorithm.iteration;

void main() {
    splitter("test", '\n');
}
```

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