Ok, so I’m trying to set `max_depth`

at the command line with CmdStan. I first try the following:

```
../stan_models/rff-fb id=1 data file=curve_data.Rdump output file=output-1.csv max_depth=15
```

This gets me the following error messages:

```
max_depth=15 is either mistyped or misplaced.
Perhaps you meant one of the following valid configurations?
method=sample sample algorithm=hmc hmc engine=nuts nuts max_depth=<int>
A method must be specified!
Failed to parse arguments, terminating Stan
```

Ok, that advice seems simple enough, so the command line is now as follows:

```
../stan_models/rff-fb id=1 data file=curve_data.Rdump output file=output-1.csv method=sample sample algorithm=hmc hmc engine=nuts nuts max_depth=15
```

Now I get these error messages:

```
sample is either mistyped or misplaced.
Perhaps you meant one of the following valid configurations?
method=sample sample
Failed to parse arguments, terminating Stan
```

To say that this is less than helpful is putting it mildly. What am I missing here?

ETA: I figured out how the error messages were lying to me. This works:

```
../stan_models/rff-fb id=1 data file=curve_data.Rdump output file=output-1.csv method=sample algorithm=hmc engine=nuts max_depth=15
```

This also works:

`../stan_models/rff-fb id=1 data file=curve_data.Rdump output file=output-1.csv sample algorithm=hmc engine=nuts max_depth=15`