Remove dead code. #516

Job	Run time
Pre-commit checks	33s
Integration tests (py39)	3m 57s
Unit tests (py39, ubuntu-latest)	3m 53s
Integration tests (py310)	3m 59s
Unit tests (py39, windows-latest)	2m 54s
Integration tests (py311)	4m 8s
Unit tests (py39, macos-latest)	2m 45s
Integration tests (py312)	3m 57s
Unit tests (py310, ubuntu-latest)	3m 46s
Integration tests (py313)	3m 55s
Unit tests (py310, windows-latest)	3m 19s
Integration tests (antlr410)	3m 50s
Unit tests (py310, macos-latest)	2m 46s
Integration tests (antlr411)	4m 3s
Unit tests (py311, ubuntu-latest)	3m 46s
Integration tests (antlr412)	4m 10s
Unit tests (py311, windows-latest)	3m 20s
Integration tests (antlr413)	3m 55s
Unit tests (py311, macos-latest)	3m 1s
Integration tests (sa1)	4m 1s
Unit tests (py312, ubuntu-latest)	3m 42s
Integration tests (sa2)	4m 0s
Unit tests (py312, windows-latest)	3m 19s
Unit tests (py312, macos-latest)	2m 13s
Unit tests (py313, ubuntu-latest)	3m 43s
Unit tests (py313, windows-latest)	3m 14s
Unit tests (py313, macos-latest)	2m 38s
Unit tests (antlr410, ubuntu-latest)	3m 46s
Unit tests (antlr410, windows-latest)	2m 53s
Unit tests (antlr410, macos-latest)	2m 33s
Unit tests (antlr411, ubuntu-latest)	3m 40s
Unit tests (antlr411, windows-latest)	3m 10s
Unit tests (antlr411, macos-latest)	2m 49s
Unit tests (antlr412, ubuntu-latest)	3m 46s
Unit tests (antlr412, windows-latest)	2m 54s
Unit tests (antlr412, macos-latest)	2m 33s
Unit tests (antlr413, ubuntu-latest)	3m 53s
Unit tests (antlr413, windows-latest)	3m 13s
Unit tests (antlr413, macos-latest)	2m 9s
	2h 10m 6s

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