When attempting a build on a project that has no extras, the following error occurs:
Traceback (most recent call last):
File "/var/folders/f2/2plv6q2n7l932m2x004jlw340000gn/T/pip-run-m2vzbehk/pyproject_hooks/_in_process/_in_process.py", line 373, in <module>
main()
File "/var/folders/f2/2plv6q2n7l932m2x004jlw340000gn/T/pip-run-m2vzbehk/pyproject_hooks/_in_process/_in_process.py", line 357, in main
json_out["return_val"] = hook(**hook_input["kwargs"])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/var/folders/f2/2plv6q2n7l932m2x004jlw340000gn/T/pip-run-m2vzbehk/pyproject_hooks/_in_process/_in_process.py", line 326, in build_sdist
return backend.build_sdist(sdist_directory, config_settings)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/var/folders/f2/2plv6q2n7l932m2x004jlw340000gn/T/pip-run-m2vzbehk/coherent/build/backend.py", line 193, in build_sdist
metadata = Metadata.discover()
^^^^^^^^^^^^^^^^^^^
File "/var/folders/f2/2plv6q2n7l932m2x004jlw340000gn/T/pip-run-m2vzbehk/coherent/build/backend.py", line 142, in discover
return cls(cls._discover_fields())
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/var/folders/f2/2plv6q2n7l932m2x004jlw340000gn/T/pip-run-m2vzbehk/coherent/build/backend.py", line 121, in __init__
for item in always_items(values):
File "/var/folders/f2/2plv6q2n7l932m2x004jlw340000gn/T/pip-run-m2vzbehk/coherent/build/backend.py", line 155, in _discover_fields
for extra in discovery.extras_from_deps(deps):
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/var/folders/f2/2plv6q2n7l932m2x004jlw340000gn/T/pip-run-m2vzbehk/coherent/build/discovery.py", line 139, in extras_from_deps
return functools.reduce(operator.or_, map(extras_from_dep, deps))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: reduce() of empty iterable with no initial value
When attempting a build on a project that has no extras, the following error occurs: