{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"trace!(\"is_used({:?}):"}]}
        trace!("is_used({:?}): use_count: {:?}", local, self.use_count[local]);
    fn is_used(&self, local: Local) -> bool {
        local.as_u32() <= self.arg_count || self.use_count[local] != 0