shutil.copytree copies directories and files but fails with that same directory with '[Errno 1] Operation not permitted')

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-05-07.03:47:46.001>
labels = ['3.7', 'type-bug', 'library']
title = "shutil.copytree copies directories and files but fails with that same directory with '[Errno 1] Operation not permitted')"
updated_at = <Date 2019-05-10.02:57:31.951>
user = 'https://github.com/rbavery'

bugs.python.org fields:

activity = <Date 2019-05-10.02:57:31.951>
actor = 'giampaolo.rodola'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-05-07.03:47:46.001>
creator = 'rbavery'
dependencies = []
files = []
hgrepos = []
issue_num = 36823
keywords = []
message_count = 4.0
messages = ['341677', '341701', '341803', '342048']
nosy_count = 4.0
nosy_names = ['giampaolo.rodola', 'tarek', 'Windson Yang', 'rbavery']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36823'
versions = ['Python 3.7']