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app-store-optimization/skills/loki-mode/benchmarks/results/2026-01-05-10-37-54/swebench-loki-patches/astropy__astropy-12907.patch

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# astropy__astropy-12907
# Loki Mode Multi-Agent Patch
# Attempts: 1
Based on the architect's analysis, I need to generate a patch for the astropy repository's `separable.py` file. The issue is in the `_cstack` function where it uses `np.eye(right.n_inputs)` instead of recursively computing the separability matrix for nested CompoundModels.
Let me generate the patch based on the analysis:
```
--- a/astropy/modeling/separable.py
+++ b/astropy/modeling/separable.py
@@ -242,7 +242,11 @@ def _cstack(left, right):
cright = _coord_matrix(right, 'right', noutp)
else:
cright = np.zeros((noutp, right.n_inputs))
- cright[-right.n_outputs:, -right.n_inputs:] = np.eye(right.n_inputs)
+ if isinstance(right, CompoundModel):
+ cright[-right.n_outputs:, -right.n_inputs:] = _separable(right)
+ else:
+ cright[-right.n_outputs:, -right.n_inputs:] = np.eye(right.n_inputs)
+
return np.vstack([cleft, cright])
```