{"ast_node_type":"variable","tokens":[{"end":67,"kind":"keyword","start":0,"text":"let"}]}
    let vtable_const = cx.const_data_from_alloc(vtable_allocation);
    let vtable_allocation = tcx.global_alloc(vtable_alloc_id).unwrap_memory();
    let align = cx.data_layout().pointer_align().abi;