MutaFix run: toolz-001

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

fixedoutcome
4swall time
2model calls
$0.0003API cost
Benchmark ground truth (hidden from the agent)
toolz/dicttoolz.py:136 · operator NEGCOND · function toolz/dicttoolz.py::valfilter
- if not (predicate(v)):   (injected bug)+ if predicate(v):   (original)
retriever rank 1 of 20 · ranker position 1 · patched the right function yes · exact restore yes

Trace

reproduce
+0.44s
4 failing test(s) · 4 failed, 182 passed, 1 skipped, 1 deselected · 0.44s
failing tests and errors
toolz/tests/test_curried.py::test_curried_namespace
toolz/tests/test_dicttoolz.py::TestDict::test_valfilter
toolz/tests/test_dicttoolz.py::TestDefaultDict::test_valfilter
toolz/tests/test_dicttoolz.py::TestCustomMapping::test_valfilter
toolz/tests/test_curried.py::test_curried_namespace
E   AssertionError: There are missing functions in toolz.curried:
E       _signatures    
E   compatibility    
E   curried    
E   dicttoolz    
E   functoolz    
E   itertoolz    
E   recipes    
E   sandbox    
E   tests    
E   toolz    
E   utils
toolz/tests/test_dicttoolz.py::TestDict::test_valfilter
E   assert {2: 3} == {1: 2}
E     
E     Left contains 1 more item:
E     {2: 3}
E     Right contains 1 more item:
E     {1: 2}
E     Use -v to get more diff
trace
+0.83s
re-ran 2 test file(s) with the trace plugin: 4 failing and 57 passing tests, 13 library functions ran in a failing test · 0.37s
toolz/tests/test_curried.py, toolz/tests/test_dicttoolz.py
retrieve
+0.83s
161 functions indexed, 49 reachable from toolz/tests/test_curried.py::test_curried_namespace in the static call graph. Kept 20 candidates, ranked by spectrum score (Ochiai), call graph and BM25 break ties.
candidates in retriever order
  1. toolz/dicttoolz.py::valfilter call depth 1 · Ochiai 1.00 (failing 4, passing 0)
  2. toolz/_signatures.py::_has_keywords call depth - · Ochiai 0.50 (failing 1, passing 0)
  3. toolz/_signatures.py::_num_required_args call depth - · Ochiai 0.50 (failing 1, passing 0)
  4. toolz/_signatures.py::check_keywords call depth - · Ochiai 0.50 (failing 1, passing 0)
  5. toolz/_signatures.py::check_required_args call depth - · Ochiai 0.50 (failing 1, passing 0)
  6. toolz/functoolz.py::has_keywords call depth - · Ochiai 0.35 (failing 1, passing 1)
  7. toolz/functoolz.py::num_required_args call depth - · Ochiai 0.35 (failing 1, passing 1)
  8. toolz/functoolz.py::curry.__init__ call depth 1 · Ochiai 0.20 (failing 1, passing 5)
  9. toolz/functoolz.py::InstanceProperty.__get__ call depth - · Ochiai 0.20 (failing 1, passing 5)
  10. toolz/functoolz.py::curry.__call__ call depth 1 · Ochiai 0.19 (failing 1, passing 6)
  11. toolz/functoolz.py::_check_sigspec call depth 3 · Ochiai 0.19 (failing 1, passing 6)
  12. toolz/dicttoolz.py::merge call depth 1 · Ochiai 0.14 (failing 1, passing 12)
  13. toolz/dicttoolz.py::_get_factory call depth 2 · Ochiai 0.10 (failing 1, passing 24)
  14. toolz/functoolz.py::curry.__reduce__ call depth 1 · Ochiai 0.00 (failing 0, passing 0)
  15. toolz/curried/exceptions.py::merge_with call depth 1 · Ochiai 0.00 (failing 0, passing 2)
  16. toolz/curried/exceptions.py::merge call depth 1 · Ochiai 0.00 (failing 0, passing 1)
  17. toolz/dicttoolz.py::merge_with call depth 1 · Ochiai 0.00 (failing 0, passing 9)
  18. toolz/itertoolz.py::join call depth 1 · Ochiai 0.00 (failing 0, passing 0)
  19. toolz/functoolz.py::curry.__signature__ call depth 1 · Ochiai 0.00 (failing 0, passing 0)
  20. toolz/functoolz.py::curry.__eq__ call depth 1 · Ochiai 0.00 (failing 0, passing 0)
rank
+0.83s
spectrum order kept (no model call)
  1. toolz/dicttoolz.py::valfilter
  2. toolz/_signatures.py::_has_keywords
  3. toolz/_signatures.py::_num_required_args
  4. toolz/_signatures.py::check_keywords
  5. toolz/_signatures.py::check_required_args
read
+1.65s
turn 1 · NVIDIA-Nemotron-3-Nano-30B-A3B · 2327 in / 56 out · 0.82s · $0.00015

read toolz/dicttoolz.py::valfilter

The failing tests involve valfilter behavior and namespace comparison; valfilter is directly implicated in 4/4 failing tests and is the top-ranked candidate by fault localization.

patch
+4.0s
turn 2 · NVIDIA-Nemotron-3-Nano-30B-A3B · 2677 in / 129 out · 1.69s · $0.00019

The valfilter function is filtering values based on a predicate, but the logic is inverted. The test expects items where the predicate is true to be kept, but the current code keeps items where the predicate is false. Changing the condition from 'if not (predicate(v)):' to 'if predicate(v):' fixes the filtering behavior, which aligns with the failing test expectations.

--- a/toolz/dicttoolz.py+++ b/toolz/dicttoolz.py@@ -134,5 +134,5 @@     rv = factory()     for k, v in d.items():-        if not (predicate(v)):+        if predicate(v):             rv[k] = v     return rv

tests: all tests pass 186 passed, 1 skipped, 1 deselected

Final patch

--- a/toolz/dicttoolz.py+++ b/toolz/dicttoolz.py@@ -134,5 +134,5 @@     rv = factory()     for k, v in d.items():-        if not (predicate(v)):+        if predicate(v):             rv[k] = v     return rv