pythongh-111933: fix broken link to A.Neumaier article

skirpichev · skirpichev · commit f2a7a57cf550 · 2023-11-10T10:52:06.000+03:00
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
@@ -2611,7 +2611,7 @@ builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start)
             }
             if (PyFloat_CheckExact(item)) {
                 // Improved Kahan–Babuška algorithm by Arnold Neumaier
-                // https://www.mat.univie.ac.at/~neum/scan/01.pdf
+                // https://web.archive.org/web/20220804051351/https://www.mat.univie.ac.at/~neum/scan/01.pdf
                 double x = PyFloat_AS_DOUBLE(item);
                 double t = f_result + x;
                 if (fabs(f_result) >= fabs(x)) {

Original file line number	Diff line number	Diff line change
`@@ -2611,7 +2611,7 @@ builtin_sum_impl(PyObject module, PyObject iterable, PyObject *start)`
`2611`	`2611`	`}`
`2612`	`2612`	`if (PyFloat_CheckExact(item)) {`
`2613`	`2613`	`// Improved Kahan–Babuška algorithm by Arnold Neumaier`
`2614`		`- // https://www.mat.univie.ac.at/~neum/scan/01.pdf`
	`2614`	`+ // https://web.archive.org/web/20220804051351/https://www.mat.univie.ac.at/~neum/scan/01.pdf`
`2615`	`2615`	`double x = PyFloat_AS_DOUBLE(item);`
`2616`	`2616`	`double t = f_result + x;`
`2617`	`2617`	`if (fabs(f_result) >= fabs(x)) {`