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sympy__sympy-23117

This is a sympy repository issue, but I'm in a different project directory. Since this is asking for a patch for a GitHub issue, I need to understand the code from the traceback and provide the fix. Let me analyze the issue and provide the…

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mkdir -p .claude/skills/sympy-sympy-23117 && curl -fsSL https://doutorai.pt/data/lib/skills__sympy-sympy-23117.md -o .claude/skills/sympy-sympy-23117/SKILL.md

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Content

This is a sympy repository issue, but I'm in a different project directory. Since this is asking for a patch for a GitHub issue, I need to understand the code from the traceback and provide the fix. Let me analyze the issue and provide the patch directly based on the traceback information.

The issue is in `sympy/tensor/array/ndim_array.py` at line 120, in the `_scan_iterable_shape` method. The problem is:

```python
elems, shapes = zip(*[f(i) for i in pointer])
```

When `pointer` is an empty list `[]`, `zip(*[])` returns an empty iterator, and trying to unpack it into two variables fails wit

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