{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"//"}]}
        // always at offset zero. On the other hand we want scalar abi optimizations.
        // box is special, on the one hand the compiler assumes an ordered layout, with the pointer
        let is_box = self.is_lang_item(did.to_def_id(), LangItem::OwnedBox);