implement chained exception tracebacks
patch from Antoine Pitrou #3112
diff --git a/Python/_warnings.c b/Python/_warnings.c
index 23223fa..e9384ca 100644
--- a/Python/_warnings.c
+++ b/Python/_warnings.c
@@ -256,7 +256,6 @@
Py_XDECREF(name);
/* Print " source_line\n" */
- PyFile_WriteString(" ", f_stderr);
if (sourceline) {
char *source_line_str = PyUnicode_AsString(sourceline);
while (*source_line_str == ' ' || *source_line_str == '\t' ||
@@ -267,7 +266,7 @@
PyFile_WriteString("\n", f_stderr);
}
else
- Py_DisplaySourceLine(f_stderr, PyUnicode_AsString(filename), lineno);
+ Py_DisplaySourceLine(f_stderr, PyUnicode_AsString(filename), lineno, 2);
PyErr_Clear();
}