sympy__sympy-18835
Based on the GitHub issue, I can see this is about the uniq function in sympy/utilities/iterables.py. The issue mentions lines 2109-2124. Let me create a patch based on the problem description.
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Based on the GitHub issue, I can see this is about the `uniq` function in `sympy/utilities/iterables.py`. The issue mentions lines 2109-2124. Let me create a patch based on the problem description.
The issue is that when iterating over `uniq(f)` and modifying the list `f` simultaneously, the output is silently wrong. The fix should check if the size of a mutable sequence changes during iteration and raise a `RuntimeError` similar to what Python does with dictionaries/sets.
Based on the issue description and standard Python patterns for `uniq` functions, here's the patch:
--- a/sympy/utiliti
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