Issue #24489: ensure a previously set C errno doesn't disturb cmath.polar().
diff --git a/Modules/cmathmodule.c b/Modules/cmathmodule.c
index eb2853c..b341c34 100644
--- a/Modules/cmathmodule.c
+++ b/Modules/cmathmodule.c
@@ -941,9 +941,10 @@
double r, phi;
if (!PyArg_ParseTuple(args, "D:polar", &z))
return NULL;
+ errno = 0;
PyFPE_START_PROTECT("polar function", return 0)
phi = c_atan2(z); /* should not cause any exception */
- r = c_abs(z); /* sets errno to ERANGE on overflow; otherwise 0 */
+ r = c_abs(z); /* sets errno to ERANGE on overflow */
PyFPE_END_PROTECT(r)
if (errno != 0)
return math_error();