{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
                let (alloc, machine) = this.get_alloc_raw_mut(alloc_id)?;
            |this, alloc_id, offset, prov| {
                interp_ok((alloc.size(), alloc.align, (alloc_id, offset, prov, alloc, machine)))