Constant proc_macro::__internal::CURRENT_SESS[]

const CURRENT_SESS: LocalKey<Cell<(*const ParseSess, Mark)>> = {
    #[inline]
    fn __init() -> Cell<(*const ParseSess, Mark)> { loop  { } }
    unsafe fn __getit()
     ->
         ::option::Option<&'static ::cell::UnsafeCell<::option::Option<Cell<(*const ParseSess,
                                                                             Mark)>>>> {
                                                                                           loop 
                                                                                                {
                                                                                           }
                                                                                       }
    unsafe { <::thread::LocalKey>::new(__getit, __init) }
}
🔬 This is a nightly-only experimental API. (proc_macro_internals #27812)