Remove unused visitor helpers - #809
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merge_key was added empty in 2025502 while merge handling remained inline in revive_hash, and it has never been called. dump_list was added empty in 59ecddb while array dumping was implemented inline in visit_array_subclass, and it has never been called. Psych visitor dispatch only targets visit_* methods.
hsbt
approved these changes
Aug 21, 2026
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Psych::Visitors::ToRuby#merge_keyandPsych::Visitors::YAMLTree#dump_listare empty private methods with no callers.They are not visitor interface methods: Psych's dispatch paths construct and call only
visit_*methods. Otherdump_*helpers are called explicitly, whiledump_listis not.The history also shows that both methods have been unused since they were added:
merge_keywas added empty in 2025502 while the same change implemented merge handling inline inrevive_hash.dump_listwas added empty in 59ecddb while the same change implemented array dumping inline invisit_array_subclass.This removes both unreachable methods.
Verification:
bundle exec ruby -Itest/lib:test -rhelper test/psych/test_merge_keys.rb— 14 tests, 19 assertions, 0 failuresbundle exec ruby -Itest/lib:test -rhelper test/psych/test_array.rb— 10 tests, 20 assertions, 0 failuresbundle exec ruby -Itest/lib:test -rhelper test/psych/visitors/test_yaml_tree.rb— 31 tests, 129 assertions, 0 failures