// SPDX-License-Identifier: Apache-2.0 OR MIT use alloc::rc::Rc;use core::marker::PhantomData;use core::panic::{RefUnwindSafe, UnwindSafe}; // Zero sized marker with the correct set of autotrait impls we want all proc// macro types to have.#[derive(Copy, Clone)]#[cfg_attr(    all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)),    derive(PartialEq, Eq))]pub(crate) struct ProcMacroAutoTraits(PhantomData<Rc<()>>); pub(crate) const MARKER: ProcMacroAutoTraits = ProcMacroAutoTraits(PhantomData); impl UnwindSafe for ProcMacroAutoTraits {}impl RefUnwindSafe for ProcMacroAutoTraits {}