trace.CoverageResult fails merging input file with non-empty callers #51524

assignee = None
closed_at = None
created_at = <Date 2009-11-06.18:12:00.434>
labels = ['easy', 'type-bug', '3.9', '3.10', '3.11', 'library']
title = 'CoverageResult fails to merge input file with non-empty callers in trace.py'
updated_at = <Date 2022-01-20.23:10:32.121>
user = 'https://bugs.python.org/glinsvad'

activity = <Date 2022-01-20.23:10:32.121>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2009-11-06.18:12:00.434>
creator = 'glinsvad'
dependencies = []
files = ['15279', '42558']
hgrepos = []
issue_num = 7275
keywords = ['easy']
message_count = 4.0
messages = ['94991', '109980', '263925', '411054']
nosy_count = 4.0
nosy_names = ['dstanek', 'glinsvad', 'berker.peksag', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue7275'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']