{"ast_node_type":"variable","tokens":[{"end":53,"kind":"keyword","start":0,"text":"let"}]}
        let mut timing_guard = Box::new(TimingGuard {
    fn start_pass(&self, pass: cranelift_codegen::timing::Pass) -> Box<dyn std::any::Any> {
            profiler: std::mem::ManuallyDrop::new(self.0.clone()),