bpo-31033: Improve the traceback for cancelled asyncio tasks (GH-19951)
When an asyncio.Task is cancelled, the exception traceback now
starts with where the task was first interrupted. Previously,
the traceback only had "depth one."
diff --git a/Python/errors.c b/Python/errors.c
index f856a79..3b42c11 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -512,6 +512,20 @@
}
}
+void
+_PyErr_ChainStackItem(_PyErr_StackItem *exc_state)
+{
+ if (exc_state->exc_type == NULL || exc_state->exc_type == Py_None) {
+ return;
+ }
+ Py_INCREF(exc_state->exc_type);
+ Py_XINCREF(exc_state->exc_value);
+ Py_XINCREF(exc_state->exc_traceback);
+ _PyErr_ChainExceptions(exc_state->exc_type,
+ exc_state->exc_value,
+ exc_state->exc_traceback);
+}
+
static PyObject *
_PyErr_FormatVFromCause(PyThreadState *tstate, PyObject *exception,
const char *format, va_list vargs)