[issue16991] Add OrderedDict written in C

[Eric Snow]

Eric Snow added the comment:

Here are the last 10 frames from the backtrace (gdb):

#0  0x00000000005b15d0 in odictiter_iternext (di=<optimized out>) at Objects/odictobject.c:1888
#1  0x0000000000453179 in PyIter_Next (iter=<optimized out>) at Objects/abstract.c:2760
#2  0x00000000005881e7 in chain_next (lz=0x7ffff2b8d878) at ./Modules/itertoolsmodule.c:1866
#3  0x0000000000537db6 in PyEval_EvalFrameEx (f=f at entry=0xcab188, throwflag=throwflag at entry=0) at Python/ceval.c:2975
#4  0x000000000053afee in fast_function (func=func at entry=0x7ffff2bc88f8, pp_stack=pp_stack at entry=0x7fffffff99f8, n=n at entry=1, na=na at entry=1, nk=nk at entry=0) at Python/ceval.c:4752
#5  0x000000000053b655 in call_function (pp_stack=pp_stack at entry=0x7fffffff99f8, oparg=oparg at entry=0) at Python/ceval.c:4679
#6  0x000000000053891d in PyEval_EvalFrameEx (f=f at entry=0xcbd588, throwflag=throwflag at entry=0) at Python/ceval.c:3198
#7  0x000000000053afee in fast_function (func=func at entry=0x7ffff2bc8840, pp_stack=pp_stack at entry=0x7fffffff9bd8, n=n at entry=3, na=na at entry=3, nk=nk at entry=0) at Python/ceval.c:4752
#8  0x000000000053b655 in call_function (pp_stack=pp_stack at entry=0x7fffffff9bd8, oparg=oparg at entry=2) at Python/ceval.c:4679
#9  0x000000000053891d in PyEval_EvalFrameEx (f=f at entry=0xc7d458, throwflag=throwflag at entry=0) at Python/ceval.c:3198

and from Python:

Current thread 0x00007f3ad9260740 (most recent call first):
  File "/home/esnow/projects/cordereddict/Lib/configparser.py", line 1115 in _join_multiline_values
  File "/home/esnow/projects/cordereddict/Lib/configparser.py", line 1109 in _read
  File "/home/esnow/projects/cordereddict/Lib/configparser.py", line 716 in read_file
  File "/home/esnow/projects/cordereddict/Lib/configparser.py", line 721 in read_string
  File "/home/esnow/projects/cordereddict/Lib/test/test_configparser.py", line 354 in test_basic
  File "/home/esnow/projects/cordereddict/Lib/unittest/case.py", line 597 in run

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16991>
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