fix: correctly handle - symbol

[incendial]

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[X] Bug fix
[ ] New rule
[ ] Changes an existing rule
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

[github-actions]

Dart Code Metrics unused files report of dart_code_metrics. ✅

Summary

• Scanned package folders: bin, example, lib
• No unused files found! ✅

[github-actions]

Dart Code Metrics analyze report of dart_code_metrics. ✅

Summary

• Scanned folders: bin, example, lib, test

• Total scanned files: 430

• Total lines of source code: 7568

• Total classes: 296

• Average Cyclomatic Number per line of code: 0.35

• Average Source Lines of Code per method: 6

• Total tech debt: 1326.0 hours

• Found issues: 6 ⚠

[codecov]

Codecov Report

Merging #895 (a1b335b) into master (75e0fb7) will not change coverage.
The diff coverage is 100.00%.

❗ Current head a1b335b differs from pull request most recent head f312adc. Consider uploading reports for the commit f312adc to get more accurate results

@@           Coverage Diff           @@
##           master     #895   +/-   ##
=======================================
  Coverage   87.37%   87.37%           
=======================================
  Files         283      283           
  Lines        5997     5997           
=======================================
  Hits         5240     5240           
  Misses        757      757           

Impacted Files	Coverage Δ
...st/prefer_commenting_analyzer_ignores/visitor.dart	100.00% <100.00%> (ø)

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