{"ast_node_type":"variable","tokens":[{"end":46,"kind":"keyword","start":0,"text":"let"}]}
                let ty = repr_type.to_ty(tcx);
                let typing_env = ty::TypingEnv::post_analysis(tcx, expr_did);
                if let Some(b) = val.try_to_bits_for_ty(tcx, typing_env, ty) {