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