Gem::SafeMarshal::Visitors::ToRuby::UnpermittedIvarError.new

# File tmp/rubies/ruby-4.0.0/lib/rubygems/safe_marshal/visitors/to_ruby.rb, line 399
def initialize(symbol:, klass:, stack:)
  @symbol = symbol
  @klass = klass
  @stack = stack
  super "Attempting to set unpermitted ivar #{symbol.inspect} on object of class #{klass} @ #{stack.join "."}"
end