[core-workflow] confusing result from `make patchcheck`

Running `make patchcheck` resulted in the following: Getting the list of files that have been added/changed ... fatal: ambiguous argument 'origin/3.7': unknown revision or path not in the working tree. How does one fix that? The commands leading up to this: git checkout -b bpo-33217-3.7 upstream/3.7 <edit Lib/enum.py and Lib/test/test_enum.py> make distclean cp Modules/Setup.dist Modules/Setup ./configure --with-pydebug && make -j2 ./python -m test.regrtest test_enum.py ./python -m test.regrtest make patcheck Any help appreciated! :) -- ~Ethan~