MutaFix run: sortedcontainers-012

ranker nvidia/NVIDIA-Nemotron-3-Nano-30B-A3B · patcher nvidia/nemotron-3-super-120b-a12b · via Nebius Token Factory

fixedoutcome
8swall time
2model calls
$0.0004API cost
Benchmark ground truth (hidden from the agent)
src/sortedcontainers/sortedset.py:376 · operator CMP · function src/sortedcontainers/sortedset.py::SortedSet.count
- return 1 if value not in self._set else 0   (injected bug)+ return 1 if value in self._set else 0   (original)
retriever rank 1 of 20 · ranker position 1 · patched the right function yes · exact restore yes

Trace

reproduce
+2.29s
2 failing test(s) · 2 failed, 297 passed · 2.29s
failing tests and errors
tests/test_coverage_sortedset.py::test_count
tests/test_stress_sortedset.py::test_stress
tests/test_coverage_sortedset.py::test_count
E   assert False
E    +  where False = all(<generator object test_count.<locals>.<genexpr> at 0x000001B2FED07BC0>)
tests/test_stress_sortedset.py::test_stress
E   assert 0 == 1
E    +  where 0 = count(2)
E    +    where count = SortedSet([2, 3, 6, 10, 14, 30, 32, 43, 44, 47, 50, 52, 55, 71, 79, 81, 102, 104, 105, 106, 108, 111, 112, 114, 115, 1...902, 1907, 1912, 1914, 1921, 1928, 1938, 1940, 1942, 1943, 1947, 1950, 1953, 1957, 1958, 1973, 1981, 1995, 1997, 1999]).count
trace
+2.7s
re-ran 2 test file(s) with the trace plugin: 2 failing and 50 passing tests, 40 library functions ran in a failing test · 0.39s
tests/test_coverage_sortedset.py, tests/test_stress_sortedset.py
retrieve
+2.7s
129 functions indexed, 84 reachable from tests/test_coverage_sortedset.py::test_count in the static call graph. Kept 20 candidates, ranked by spectrum score (Ochiai), call graph and BM25 break ties.
candidates in retriever order
  1. src/sortedcontainers/sortedset.py::SortedSet.count call depth 1 · Ochiai 1.00 (failing 2, passing 0)
  2. src/sortedcontainers/sortedset.py::SortedSet.__contains__ call depth 1 · Ochiai 0.50 (failing 1, passing 1)
  3. src/sortedcontainers/sortedset.py::SortedSet.__reversed__ call depth 1 · Ochiai 0.50 (failing 1, passing 1)
  4. src/sortedcontainers/sortedset.py::SortedSet.remove call depth 2 · Ochiai 0.50 (failing 1, passing 1)
  5. src/sortedcontainers/sortedlist.py::SortedList.__reversed__ call depth 2 · Ochiai 0.50 (failing 1, passing 1)
  6. src/sortedcontainers/sortedlist.py::SortedList.index call depth 2 · Ochiai 0.50 (failing 1, passing 1)
  7. src/sortedcontainers/sortedlist.py::SortedList.pop call depth - · Ochiai 0.50 (failing 1, passing 1)
  8. src/sortedcontainers/sortedset.py::SortedSet.pop call depth - · Ochiai 0.50 (failing 1, passing 1)
  9. src/sortedcontainers/sortedset.py::SortedSet.intersection_update call depth - · Ochiai 0.50 (failing 1, passing 1)
  10. src/sortedcontainers/sortedset.py::SortedSet.symmetric_difference_update call depth - · Ochiai 0.50 (failing 1, passing 1)
  11. src/sortedcontainers/sortedset.py::SortedSet.__repr__ call depth 1 · Ochiai 0.41 (failing 1, passing 2)
  12. src/sortedcontainers/sortedset.py::SortedSet.difference_update call depth 2 · Ochiai 0.41 (failing 1, passing 2)
  13. src/sortedcontainers/sortedset.py::SortedSet.copy call depth - · Ochiai 0.41 (failing 1, passing 2)
  14. src/sortedcontainers/sortedset.py::SortedSet.__delitem__ call depth 1 · Ochiai 0.35 (failing 1, passing 3)
  15. src/sortedcontainers/sortedlist.py::SortedList.__delitem__ call depth 2 · Ochiai 0.35 (failing 1, passing 3)
  16. src/sortedcontainers/sortedlist.py::SortedList._loc call depth 2 · Ochiai 0.35 (failing 1, passing 3)
  17. src/sortedcontainers/sortedset.py::SortedSet.discard call depth - · Ochiai 0.35 (failing 1, passing 3)
  18. src/sortedcontainers/sortedlist.py::SortedList.remove call depth 2 · Ochiai 0.32 (failing 1, passing 4)
  19. src/sortedcontainers/sortedset.py::SortedSet._check call depth 1 · Ochiai 0.29 (failing 1, passing 5)
  20. src/sortedcontainers/sortedlist.py::SortedList._check call depth 1 · Ochiai 0.29 (failing 1, passing 5)
rank
+2.7s
spectrum order kept (no model call)
  1. src/sortedcontainers/sortedset.py::SortedSet.count
  2. src/sortedcontainers/sortedset.py::SortedSet.__contains__
  3. src/sortedcontainers/sortedset.py::SortedSet.__reversed__
  4. src/sortedcontainers/sortedset.py::SortedSet.remove
  5. src/sortedcontainers/sortedlist.py::SortedList.__reversed__
read
+4.3s
turn 1 · NVIDIA-Nemotron-3-Nano-30B-A3B · 2538 in / 107 out · 1.6s · $0.00018

read src/sortedcontainers/sortedset.py::SortedSet.count

The test failure shows that `count` returns a generator object instead of an integer, which matches the assertion error in test_count. The candidate SortedSet.count is the only function that directly implements the `count` method, and its current implementation returns `1 if value not in self._set else 0`, which is logically inverted and would cause incorrect counting behavior. This is the most likely source of the bug.

patch
+8.28s
turn 2 · NVIDIA-Nemotron-3-Nano-30B-A3B · 2883 in / 127 out · 1.14s · $0.00020

The current implementation incorrectly returns 1 when the value is NOT in the set and 0 when it IS in the set, which inverts the expected count. The test expects 1 for present values and 0 for absent values, so the condition must be flipped to return 1 when the value is in the set.

--- a/src/sortedcontainers/sortedset.py+++ b/src/sortedcontainers/sortedset.py@@ -374,5 +374,5 @@          """-        return 1 if value not in self._set else 0+        return 1 if value in self._set else 0      def discard(self, value):

tests: all tests pass 299 passed

Final patch

--- a/src/sortedcontainers/sortedset.py+++ b/src/sortedcontainers/sortedset.py@@ -374,5 +374,5 @@          """-        return 1 if value not in self._set else 0+        return 1 if value in self._set else 0      def discard(self, value):