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_integer` (the base must be an integer)
3. Check that `p.exp.is_positive` (the exponent must be positive)

Based on the hints, the correct fix is:
```python
if (p == q or p == -q or
        p.is_Pow and p.base == q and q.is_integer and p.exp.is_Integer and p.exp.is_positive or
        p.is_integer and q == 1):
    return S.Zero
```

The file would be in `sympy/core/mod.py`. Let me produce the patch:

--- a/sympy/core/mod.py
+++ b/sympy/core/mod.py
@@ -123,7 +123,8 @@ def doit(p, q):
             return p
 
         if (p == q or p == -q or
-                p.is_Pow and p.exp.is_Integer and p.base == q or
+                p.is_Pow and p.base == q and q.is_integer and
+                p.exp.is_Integer and p.exp.is_positive or
                 p.is_integer and q == 1):
             return S.Zero