{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
            // in current MIR construction, all non-control-flow rvalue
        if !erased_ty.is_sized(tcx, self.infcx.typing_env(self.infcx.param_env)) {
            // expressions evaluate through `as_temp` or `into` a return