Fix warnings

[gilch]

Fixes #212.

Also configures warnings to fail the workflow, which would have caught this issue, which I confirmed in https://github.com/gilch/hissp/actions/runs/5086943652/jobs/9141865517.

Turns out deprecation warnings don't even print by default. This may turn out to be too strict, but we'll cross that bridge when we come to it.

[gilch]

Well, we got there pretty quickly. The warning seems to be in the test runner itself. Maybe I can tweak the config a bit, or ignore warnings just for that package. Might take a few experiments.

[codecov]

Codecov Report

Merging #213 (0ee0f12) into master (6be47da) will decrease coverage by 0.29%.
The diff coverage is 100.00%.

❗ Current head 0ee0f12 differs from pull request most recent head f55da8d. Consider uploading reports for the commit f55da8d to get more accurate results

@@             Coverage Diff             @@
##            master     #213      +/-   ##
===========================================
- Coverage   100.00%   99.71%   -0.29%     
===========================================
  Files            6        6              
  Lines          706      704       -2     
  Branches       111      110       -1     
===========================================
- Hits           706      702       -4     
- Misses           0        1       +1     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
src/hissp/repl.py	96.55% <ø> (-3.45%)	⬇️
src/hissp/reader.py	100.00% <100.00%> (ø)

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[gilch]

Wow, first try. I'm going to swap the order so I don't merge in failing commits.

[gilch]

Hmm. I maybe lost coverage on a one-line branch in the repl module. That may be dead code after removing that entry point. __main__ does that on its own. If you're calling it manually rather than via __main__, you should probably call hissp.repl.interact() instead.

I'll try removing the default for the __main__ argument to eliminate the branch.