sympy__sympy-13177

This is not the sympy repository. This issue is about the sympy/sympy repository. Based on the problem statement, I need to create a patch for the Mod function's eval logic. Let me understand the issue:

The problem is in the `Mod` function's eval method where it incorrectly returns 0 for `Mod(x**2, x)` when `x` is not an integer. The current code:
```python
if (p == q or p == -q or
        p.is_Pow and p.exp.is_Integer and p.base == q or
        p.is_integer and q == 1):
    return S.Zero
```

The fix should:
1. Check `p.is_Pow` first (to avoid AttributeError on `p.base`)
2. Check that `q.is_

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