pdb.run() does not trace destructors of __main__

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-05-10.20:27:37.753>
labels = ['3.7', '3.8', 'type-bug', 'library']
title = 'pdb.run() does not trace destructors of __main__'
updated_at = <Date 2018-05-10.20:33:13.995>
user = 'https://github.com/xdegaye'

bugs.python.org fields:

activity = <Date 2018-05-10.20:33:13.995>
actor = 'xdegaye'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-05-10.20:27:37.753>
creator = 'xdegaye'
dependencies = []
files = []
hgrepos = []
issue_num = 33458
keywords = []
message_count = 2.0
messages = ['316375', '316376']
nosy_count = 1.0
nosy_names = ['xdegaye']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue33458'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']