{"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"let"}]}
    let end = bx.append_sibling_block("va_arg.end");
    let from_regsave = bx.append_sibling_block("va_arg.from_regsave");
    let ptr_align_abi = bx.tcx().data_layout.pointer_align().abi;