{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"//"}]}
        // first copy the provenance to a temporary buffer, because
        let src_bytes = src_alloc.get_bytes_unchecked(src_range).as_ptr(); // raw ptr, so we can also get a ptr to the destination allocation
        // `get_bytes_mut` will clear the provenance, which is correct,