PP::PPMethods#guard_inspect_key

# File tmp/rubies/ruby-4.1.0-preview1/lib/pp.rb, line 147
def guard_inspect_key
  recursive_state = Thread.current[:__recursive_key__] ||= {}.compare_by_identity
  save = recursive_state[:inspect] ||= {}.compare_by_identity
  begin
    recursive_state[:inspect] = {}.compare_by_identity
    yield
  ensure
    recursive_state[:inspect] = save
  end
end