Location can't be both implicit and explicit

The following code exists in the `Tokenizer.Tokenize` method:

```
var rootIsExplicit = FirstArgIsRootCommand(args, rootCommand, inferRootCommand);
var rootLocation = Location.CreateRoot(rootCommand.Name, rootIsExplicit, rootIsExplicit ? 0 : -1);
```

Keep in mind that rootIsExplicit specifies "Explicit".

The `Location.CreateRoot` method signature is as follows:

`internal static Location CreateRoot(string exeName, bool isImplicit, int start)`

Note that it is asking if the location is "Implicit".

There appears to be a discrepancy between whether the location is implicit or explicit.