Add test for linenumber of return in nested try statements.

Author: markshannon

Lib/test/test_sys_settrace.py

@@ -976,6 +976,26 @@ class A:
              (3, 'return'),
              (1, 'return')])
 
+    def test_try_in_try(self):
+        def func():
+            try:
+                try:
+                    pass
+                except Exception as ex:
+                    pass
+            except Exception:
+                pass
+
+        # This doesn't conform to PEP 626
+        self.run_and_compare(func,
+            [(0, 'call'),
+             (1, 'line'),
+             (2, 'line'),
+             (3, 'line'),
+             (5, 'line'),
+             (5, 'return')])
+
+
 class SkipLineEventsTraceTestCase(TraceTestCase):
     """Repeat the trace tests, but with per-line events skipped"""