Just keep the old frame around, for better or worse we need this side…

…-effect inducing reference for some tests that need the frames (the StackPrinter action).

src/hunter/_tracer.pxd

@@ -19,7 +19,7 @@ cdef extern from *:
     ctypedef extern class types.FrameType[object PyFrameObject, check_size ignore]:
         pass
 
-    ctypedef extern class types.CodeType[object PyCodeObject]:
+    ctypedef extern class types.CodeType[object PyCodeObject, check_size ignore]:
         cdef object co_filename
         cdef object co_name
         cdef int co_argcount

tests/eviltracer.pxd

@@ -1,13 +1,18 @@
+# cython: language_level=3str
 cimport cython
 
 
 cdef extern from "vendor/_compat.h":
     """
-    #if PY_VERSION_HEX >= 0x030900A4
+    #if PY_VERSION_HEX >= 0x030B00A7
     #include "internal/pycore_frame.h"
     #endif
     """
 
+    ctypedef struct PyObject
+
+    ctypedef class types.FrameType[object PyFrameObject, check_size ignore]:
+        pass
 
 @cython.final
 cdef class EvilTracer:

tests/eviltracer.pyx

@@ -21,6 +21,7 @@ cdef class EvilTracer:
             return
         detached_event = fast_detach(event, lambda obj: obj)
         detached_event.detached = False
+        detached_event.frame = event.frame
         self._calls.append(detached_event)
 
     def __enter__(self):

tests/test_tracer.py

@@ -1,13 +1,16 @@
 from __future__ import print_function
 
 import asyncio
+import faulthandler
 import functools
 import os
 import pickle
 import platform
 import sys
 import threading
+from io import StringIO
 from pprint import pprint
+from urllib.parse import urlencode
 
 import pytest
 
@@ -27,16 +30,7 @@
 
 from utils import DebugCallPrinter
 
-try:
-    from urllib import urlencode
-except ImportError:
-    from urllib.parse import urlencode
-
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from io import StringIO
-
+faulthandler.enable()
 
 if hunter.Tracer.__module__ == 'hunter.tracer':
 
@@ -469,19 +463,6 @@ def foo():
     assert out.getvalue().endswith("node += 'x'\n")
 
 
-def test_pickle():
-    out = []
-    with hunter.trace(
-        lambda event: out.append(pickle.dumps(event)),
-    ):
-
-        def foo():
-            pass
-
-        foo()
-    assert out == []
-
-
 def test_fullsource_decorator_issue(LineMatcher):
     out = StringIO()
     with trace(kind='call', action=CodePrinter(stream=out)):
@@ -1450,7 +1431,7 @@ def a():
     )
 
 
-def test_pickle(LineMatcher):
+def test_pickle():
     out = []
 
     def pickler(event):
@@ -1467,7 +1448,7 @@ def foo():
 
         foo()
 
-    with pytest.raises(TypeError, match="cannot pickle 'hunter._?event.Event' object") as exc:
+    with pytest.raises(TypeError, match="can.+t pickle '?hunter._?event.Event'? objects?") as exc:
         pickle.dumps(out)