{"ast_node_type":"function","tokens":[{"end":91,"kind":"keyword","start":0,"text":"fn"}]}
        fn write_allocation_track_relocs<'tcx, Prov: Provenance, Extra, Bytes: AllocBytes>(
        // Cannot be a closure because it is generic in `Prov`, `Extra`.
            fmt: &mut std::fmt::Formatter<'_>,