Another debug

Author: mroeschke

pandas/_libs/tslibs/timedeltas.pxd

@@ -10,6 +10,7 @@ cpdef int64_t delta_to_nanoseconds(
     delta, NPY_DATETIMEUNIT reso=*, bint round_ok=*
 ) except? -1
 cpdef int64_t debug_divmod_bug(delta) except? -1
+cpdef timedelta debug_2()
 cdef convert_to_timedelta64(object ts, str unit)
 cdef bint is_any_td_scalar(object obj)
 

pandas/_libs/tslibs/timedeltas.pyx

@@ -233,6 +233,14 @@ def ints_to_pytimedelta(ndarray m8values, box=False):
 # ----------------------------------------------------------------------
 
 
+cpdef timedelta debug_2():
+    cdef int64_t val = -420000000000
+    us, remainder = divmod(val, 1000)
+    if remainder >= 500:
+        us += 1
+    return timedelta(microseconds=us)
+
+
 cpdef int64_t debug_divmod_bug(delta) except? -1:
     cdef int64_t n, div, mod, conv = 1000 * 1
     if PyDelta_Check(delta):

pandas/tests/test_debug.py

@@ -1,4 +1,7 @@
-from pandas._libs.tslibs.timedeltas import debug_divmod_bug
+from pandas._libs.tslibs.timedeltas import (
+    debug_2,
+    debug_divmod_bug,
+)
 
 import pandas as pd
 
@@ -19,3 +22,7 @@ def test_debug_divmod_bug():
     result = debug_divmod_bug(td)
     expected = non_buggy_divmod(td)
     assert result == expected
+
+
+def test_debug_2():
+    assert False, debug_2()