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          "content": "Review for defects. Only report defects that actually exist.\n\n```python\ndef copy_file(src, dst):\n    with open(src, 'rb') as fin, open(dst, 'wb') as fout:\n        shutil.copyfileobj(fin, fout, length=1024 * 1024)\n```"
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              "content": "**Defect: missing import**\n\n```python\nimport shutil\n```\n\nThe function uses `shutil.copyfileobj`, but `shutil` is never imported. This will raise `NameError: name 'shutil' is not defined` when the function is called.\n\nOther than that, the implementation is fine — it opens both files with context managers, uses binary mode, and copies in 1 MB chunks, which is a proper way to copy a file.",
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              "reasoning": "Missing import shutil — that's the defect."
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