{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"fcx.tcx.require_lang_item(hir::LangItem::Sized,"}]}
                    fcx.tcx.require_lang_item(hir::LangItem::Sized, DUMMY_SP),
                    fcx.tcx,
                    [sig.output()],