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eprintln!("> {frame}\n"); } } }); default_hook(panic_info); })); } static SET_HOOK: Once = Once::new(); SET_HOOK.call_once(set_hook); with_ctx(|ctx| ctx.push(frame)); PanicContext { _priv: () } } fn with_ctx(f: impl FnOnce(&mut Vec<String>)) { thread_local! { static CTX: RefCell<Vec<String>> = const { RefCell::new(Vec::new()) }; } CTX.with(|ctx| f(&mut ctx.borrow_mut())); }