marker.rs

 1// SPDX-License-Identifier: Apache-2.0 OR MIT
 2
 3use alloc::rc::Rc;
 4use core::marker::PhantomData;
 5use core::panic::{RefUnwindSafe, UnwindSafe};
 6
 7// Zero sized marker with the correct set of autotrait impls we want all proc
 8// macro types to have.
 9#[derive(Copy, Clone)]
10#[cfg_attr(
11    all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)),
12    derive(PartialEq, Eq)
13)]
14pub(crate) struct ProcMacroAutoTraits(PhantomData<Rc<()>>);
15
16pub(crate) const MARKER: ProcMacroAutoTraits = ProcMacroAutoTraits(PhantomData);
17
18impl UnwindSafe for ProcMacroAutoTraits {}
19impl RefUnwindSafe for ProcMacroAutoTraits {}