{"ast_node_type":"function","tokens":[{"end":62,"kind":"keyword","start":0,"text":"fn"}]}
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
impl fmt::Debug for AllocId {
        if f.alternate() { write!(f, "a{}", self.0) } else { write!(f, "alloc{}", self.0) }