{"ast_node_type":"function","tokens":[{"end":62,"kind":"keyword","start":0,"text":"fn"}]}
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
impl<Prov: Provenance> fmt::Display for Pointer<Option<Prov>> {
        if self.provenance.is_none() && self.offset.bytes() == 0 {