{"ast_node_type":"variable","tokens":[{"end":46,"kind":"keyword","start":0,"text":"let"}]}
        let typing_env = body.typing_env(tcx);
    fn new(tcx: TyCtxt<'tcx>, def_id: DefId, body: &Body<'tcx>) -> Self {
        let codegen_fn_attrs = tcx.codegen_fn_attrs(def_id);