Octave Symbolic package: assign `nan` to symfun

[NVS Abhilash]

I am using the symbolic package, I have installed `2.5.0` from the source
[1]. I get this error in Octave 4.3.0+

```
syms x;
f(x) = nan
error: subscript indices must be integers or boolean
error: called from
    subsindex at line 64 column 5

```

I am a bit confused. Is this expected?
But if I do
```
syms x;
f(x) = nan + x
f(x) = (symfun) nan
```

Maybe Octave cannot identify `f(x) = nan` to be a symfun. But it gets to
know that when we do `f(x) = nan + x` because x is a symbol.

Is it a bug, or is it expected?

[1]: https://github.com/cbm755/octsympy



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NVS Abhilash
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