How can we get this into main cpython

[fenchu]

I'm using pyenv which fetched its sources from main python distros, You fixed this back in 3.4, but has not been merged into main.

$ pyenv install 3.6.3

Downloading Python-3.6.3.tar.xz...
-> https://www.python.org/ftp/python/3.6.3/Python-3.6.3.tar.xz
Installing Python-3.6.3...

BUILD FAILED (CYGWIN_NT-10.0 2.9.0(0.318/5/3) using python-build 1.1.5-44-g85a66                                                     a9)

Inspect or clean up the working tree at /tmp/python-build.20171204104512.2636
Results logged to /tmp/python-build.20171204104512.2636.log

Last 10 log lines:
     PyStructSequence_SET_ITEM(result, 6, PyLong_FromLong(si->si_band));
                                                            ^
./Include/tupleobject.h:62:75: note: in definition of macro ‘PyTuple_SET_ITEM’
 #define PyTuple_SET_ITEM(op, i, v) (((PyTupleObject *)(op))->ob_item[i] = v)
                                                                           ^
./Modules/signalmodule.c:981:5: note: in expansion of macro ‘PyStructSequence_SE                                                     T_ITEM’
     PyStructSequence_SET_ITEM(result, 6, PyLong_FromLong(si->si_band));
     ^~~~~~~~~~~~~~~~~~~~~~~~~
make: *** [Makefile:1761: Modules/signalmodule.o] Error 1
make: *** Waiting for unfinished jobs....

[embray]

FYI this was already fixed in python/cpython@6a6967e but I don't believe it's been backported to the 3.6 branch (only 3.7+)