Code coverage warning: "No source for code: '/my/local/folder/_run_response_middleware'. (couldnt-parse)"

Describe the bug After upgrade sanic from 21.6 to 21.9, coverage, we noticed when run coverage xml, there is an error like below:

No source for code: '/my/local/folder/_run_request_middleware'.

with coverage xml -i there are more warnings:

/my/local/virtualenv/lib/python3.8/site-packages/coverage/report.py:87: CoverageWarning: Couldn't parse '/my/local/folder/_run_request_middleware': No source for code: '/my/local/folder/_run_request_middleware'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
/my/local/virtualenv/lib/python3.8/site-packages/coverage/report.py:87: CoverageWarning: Couldn't parse '/my/local/folder/_run_response_middleware': No source for code: '/my/local/folder/_run_response_middleware'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
/my/local/virtualenv/lib/python3.8/site-packages/coverage/report.py:87: CoverageWarning: Couldn't parse '/my/local/folder/connection_task': No source for code: '/my/local/folder/connection_task'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
/my/local/virtualenv/lib/python3.8/site-packages/coverage/report.py:87: CoverageWarning: Couldn't parse '/my/local/folder/handle_exception': No source for code: '/my/local/folder/handle_exception'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
/my/local/virtualenv/lib/python3.8/site-packages/coverage/report.py:87: CoverageWarning: Couldn't parse '/my/local/folder/handle_request': No source for code: '/my/local/folder/handle_request'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
/my/local/virtualenv/lib/python3.8/site-packages/coverage/report.py:87: CoverageWarning: Couldn't parse '/my/local/folder/http1_request_header': No source for code: '/my/local/folder/http1_request_header'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
/my/local/virtualenv/lib/python3.8/site-packages/coverage/report.py:87: CoverageWarning: Couldn't parse '/my/local/folder/http1_response_header': No source for code: '/my/local/folder/http1_response_header'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
/my/local/virtualenv/lib/python3.8/site-packages/coverage/report.py:87: CoverageWarning: Couldn't parse '/my/local/folder/read': No source for code: '/my/local/folder/read'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
/my/local/virtualenv/lib/python3.8/site-packages/coverage/report.py:87: CoverageWarning: Couldn't parse '/my/local/folder/send': No source for code: '/my/local/folder/send'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
Wrote XML report to coverage.xml

Code snippet

In blueprint.py

my_bp = Blueprint("my_blueprint")

Create app in a different file:

my_app = Sanic(name, load_env=False, log_config=LOG_SETTINGS)
my_app.blueprint(my_bp)
my_app.register_middleware( ..... )

Expected behavior No warning or error while generating code coverage report, like using sanic 21.6.

Environment (please complete the following information):

• OS: Ubuntu 20.04
• Version 21.9 and 21.12, not repro on 21.6
• Python: 3.8

Additional context

$ pip freeze | grep "sanic\|coverage\|pytest"
coverage==6.2
pytest==6.2.5
pytest-asyncio==0.15.1
sanic==21.9.3
sanic-routing==0.7.2
sanic-testing==0.8.2

[ahopkins]

Why are you running coverage for Sanic?

You will not get coverage for these functions because they are rewritten at startup time based upon your application’s code.

[ahopkins]

I am closing this now as the issue is not really related to Sanic. Feel free to continue the conversation.