undo unnecessary merge

Lib/traceback.py

@@ -400,32 +400,18 @@ def walk_tb(tb):
         tb = tb.tb_next
 
 
-def _get_tb_position(tb):
-    positions = _get_code_position(tb.tb_frame.f_code, tb.tb_lasti)
-    # Yield tb_lineno when co_positions does not have a line number to
-    # maintain behavior with walk_tb.
-    if positions[0] is None:
-        return tb.tb_frame, (tb.tb_lineno, ) + positions[1:]
-    return tb.tb_frame, positions
-
-
-def _walk_tb_with_full_positions(tb, _seen=None):
+def _walk_tb_with_full_positions(tb):
     # Internal version of walk_tb that yields full code positions including
     # end line and column information.
-    handler_tb = None
     while tb is not None:
-        yield _get_tb_position(tb)
-        if tb.tb_lineno != tb.tb_frame.f_lineno and _seen:
-            for exc in reversed(_seen.values()):
-                if (handler_tb := exc.__traceback__) is not tb:
-                    while handler_tb.tb_frame != tb.tb_frame:
-                        if not (handler_tb := handler_tb.tb_next):
-                            break
-                    else:
-                        break
+        positions = _get_code_position(tb.tb_frame.f_code, tb.tb_lasti)
+        # Yield tb_lineno when co_positions does not have a line number to
+        # maintain behavior with walk_tb.
+        if positions[0] is None:
+            yield tb.tb_frame, (tb.tb_lineno, ) + positions[1:]
+        else:
+            yield tb.tb_frame, positions
         tb = tb.tb_next
-    if handler_tb:
-        yield _get_tb_position(handler_tb)
 
 
 def _get_code_position(code, instruction_index):
@@ -1063,14 +1049,14 @@ def __init__(self, exc_type, exc_value, exc_traceback, *, limit=None,
         # Handle loops in __cause__ or __context__.
         is_recursive_call = _seen is not None
         if _seen is None:
-            _seen = {}
-        _seen[id(exc_value)] = exc_value
+            _seen = set()
+        _seen.add(id(exc_value))
 
         self.max_group_width = max_group_width
         self.max_group_depth = max_group_depth
 
         self.stack = StackSummary._extract_from_extended_frame_gen(
-            _walk_tb_with_full_positions(exc_traceback, _seen),
+            _walk_tb_with_full_positions(exc_traceback),
             limit=limit, lookup_lines=lookup_lines,
             capture_locals=capture_locals, cause=exc_value.__cause__,
             context=exc_value.__context__)