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pub(crate) struct CleanupEnvHookData<T: 'static> { pub(crate) data: T, pub(crate) hook: Box<dyn FnOnce(T)>, } /// Created by `Env::add_env_cleanup_hook` /// And used by `Env::remove_env_cleanup_hook` #[derive(Clone, Copy)] pub struct CleanupEnvHook<T: 'static>(pub(crate) *mut CleanupEnvHookData<T>);