[issue31908] trace module cli does not write cover files

[Michael Selik]

Michael Selik <michael.selik at gmail.com> added the comment:

While writing a patch for this, I noticed the ``lnotab`` parameter seems nearly unused. It's a dict, but is only used for its keys.

https://github.com/python/cpython/blob/master/Lib/trace.py#L333

Further, the choice to count unreached lines only when ``show_missing`` was set seems inconsistent.

https://github.com/python/cpython/blob/master/Lib/trace.py#L335

https://github.com/python/cpython/blob/master/Lib/trace.py#L280

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<https://bugs.python.org/issue31908>
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