#0  _abc__abc_subclasscheck_impl (module=0x70ac20 <small_ints+192>, subclass=0x70ac20 <small_ints+192>, self=0x787108)
    at /home/izbyshev/workspace/cpython/Modules/_abc.c:643
#1  _abc__abc_subclasscheck (module=module@entry=0x7ffff7ef6cc8, args=args@entry=0x7ffff7eccbe8, nargs=<optimized out>)
    at /home/izbyshev/workspace/cpython/Modules/clinic/_abc.c.h:135
#2  0x000000000043a7dd in _PyMethodDef_RawFastCallKeywords (kwnames=0x0, nargs=0, args=0x7ffff7eccbe8, self=0x7ffff7ef6cc8,
    method=0x7ffff7fef900 <module_functions+224>) at Objects/call.c:651
#3  _PyCFunction_FastCallKeywords (func=0x7ffff7efe900, args=args@entry=0x7ffff7eccbe8, nargs=nargs@entry=2,
    kwnames=kwnames@entry=0x0) at Objects/call.c:730
#4  0x00000000004282fd in call_function (kwnames=0x0, oparg=2, pp_stack=<synthetic pointer>) at Python/ceval.c:4541
#5  _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3111
#6  0x0000000000420608 in function_code_fastcall (co=co@entry=0x7ffff7ee4780, args=<optimized out>, args@entry=0x7fffffffd600,
    nargs=nargs@entry=2, globals=globals@entry=0x7ffff7ef8c18) at Objects/call.c:283
#7  0x0000000000439b76 in _PyFunction_FastCallDict (func=func@entry=0x7ffff7eeec80, args=args@entry=0x7fffffffd600,
    nargs=nargs@entry=2, kwargs=kwargs@entry=0x0) at Objects/call.c:322
#8  0x000000000043d149 in _PyObject_FastCallDict (kwargs=0x0, nargs=2, args=0x7fffffffd600, callable=0x7ffff7eeec80)
    at Objects/call.c:98
#9  _PyObject_Call_Prepend (callable=0x7ffff7eeec80, obj=<optimized out>, args=0x7ffff7e93240, kwargs=0x0) at Objects/call.c:904
#10 0x000000000043bb9b in _PyObject_FastCallDict (callable=0x7ffff7f7ea08, args=<optimized out>, nargs=<optimized out>, kwargs=0x0)
    at Objects/call.c:125
#11 0x000000000043c5fb in object_vacall (callable=0x7ffff7f7ea08, vargs=vargs@entry=0x7fffffffd728) at Objects/call.c:1198
#12 0x000000000043c96c in PyObject_CallFunctionObjArgs (callable=callable@entry=0x7ffff7f7ea08) at Objects/call.c:1263
#13 0x00000000005ae3af in PyObject_IsSubclass (derived=0x70ac20 <small_ints+192>, cls=0x787108) at Objects/abstract.c:2484
#14 0x00000000004ea615 in builtin_issubclass_impl (module=0x7ffff7fc0c28, class_or_tuple=<optimized out>, cls=<optimized out>)
    at Python/bltinmodule.c:2526
#15 builtin_issubclass (module=module@entry=0x7ffff7fc0c28, args=args@entry=0x7ffff7e9a9d8, nargs=<optimized out>)
    at Python/clinic/bltinmodule.c.h:708
#16 0x000000000043a7dd in _PyMethodDef_RawFastCallKeywords (kwnames=0x0, nargs=0, args=0x7ffff7e9a9d8, self=0x7ffff7fc0c28,
    method=0x6befc0 <builtin_methods+800>) at Objects/call.c:651
#17 _PyCFunction_FastCallKeywords (func=0x7ffff7f53120, args=args@entry=0x7ffff7e9a9d8, nargs=nargs@entry=2,
    kwnames=kwnames@entry=0x0) at Objects/call.c:730
#18 0x00000000004282fd in call_function (kwnames=0x0, oparg=2, pp_stack=<synthetic pointer>) at Python/ceval.c:4541
#19 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3111
#20 0x00000000004ed8c8 in PyEval_EvalFrameEx (throwflag=0, f=0x7ffff7e9a868) at Python/ceval.c:546
#21 _PyEval_EvalCodeWithName (_co=_co@entry=0x7ffff7ea4ed0, globals=globals@entry=0x7ffff7f49ee8,
    locals=locals@entry=0x7ffff7f49ee8, args=args@entry=0x0, argcount=argcount@entry=0, kwnames=kwnames@entry=0x0,
    kwargs=kwargs@entry=0x0, kwcount=kwcount@entry=0, kwstep=kwstep@entry=2, defs=defs@entry=0x0, defcount=defcount@entry=0,
    kwdefs=kwdefs@entry=0x0, closure=closure@entry=0x0, name=name@entry=0x0, qualname=qualname@entry=0x0) at Python/ceval.c:3917
#22 0x00000000004ed9f0 in PyEval_EvalCodeEx (closure=0x0, kwdefs=0x0, defcount=0, defs=0x0, kwcount=0, kws=0x0, argcount=0,
    args=0x0, locals=locals@entry=0x7ffff7f49ee8, globals=globals@entry=0x7ffff7f49ee8, _co=_co@entry=0x7ffff7ea4ed0)
    at Python/ceval.c:3946
#23 PyEval_EvalCode (co=co@entry=0x7ffff7ea4ed0, globals=globals@entry=0x7ffff7f49ee8, locals=locals@entry=0x7ffff7f49ee8)
    at Python/ceval.c:523
#24 0x000000000052da44 in run_mod (arena=0x7ffff7fc81b0, flags=0x7fffffffdd20, locals=0x7ffff7f49ee8, globals=0x7ffff7f49ee8,
    filename=0x7ffff7ec8458, mod=0x7ae5e8) at Python/pythonrun.c:1035
#25 PyRun_InteractiveOneObjectEx (fp=fp@entry=0x7ffff74a9640 <_IO_2_1_stdin_>, filename=filename@entry=0x7ffff7ec8458,
    flags=flags@entry=0x7fffffffdd20) at Python/pythonrun.c:256
#26 0x000000000052dce6 in PyRun_InteractiveLoopFlags (fp=fp@entry=0x7ffff74a9640 <_IO_2_1_stdin_>,
    filename_str=filename_str@entry=0x5fb387 "<stdin>", flags=flags@entry=0x7fffffffdd20) at Python/pythonrun.c:120
#27 0x000000000052de6c in PyRun_AnyFileExFlags (fp=0x7ffff74a9640 <_IO_2_1_stdin_>, filename=0x5fb387 "<stdin>", closeit=0,
    flags=0x7fffffffdd20) at Python/pythonrun.c:78
#28 0x000000000042e8c6 in pymain_run_file (p_cf=0x7fffffffdd20, filename=<optimized out>, fp=0x7ffff74a9640 <_IO_2_1_stdin_>)
    at Modules/main.c:423
#29 pymain_run_filename (cf=0x7fffffffdd20, pymain=0x7fffffffde20) at Modules/main.c:1518
#30 pymain_run_python (pymain=0x7fffffffde20) at Modules/main.c:2518
#31 pymain_main (pymain=pymain@entry=0x7fffffffde20) at Modules/main.c:2660
#32 0x000000000042ebac in _Py_UnixMain (argc=<optimized out>, argv=<optimized out>) at Modules/main.c:2695
#33 0x00007ffff7107f45 in __libc_start_main (main=0x420590 <main>, argc=1, argv=0x7fffffffe048, init=<optimized out>,
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe038) at libc-start.c:287
#34 0x000000000042a3d4 in _start ()