Psych::Visitors::RestrictedYAMLTree#visit_Symbol

# File tmp/rubies/ruby-4.0.0/ext/psych/lib/psych/visitors/yaml_tree.rb, line 617
def visit_Symbol sym
  unless @permitted_classes[Symbol] || @permitted_symbols[sym]
    raise DisallowedClass.new('dump', "Symbol(#{sym.inspect})")
  end

  super
end