{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"self.tcx.require_lang_item(hir::LangItem::Tuple,"}]}
                    self.tcx.require_lang_item(hir::LangItem::Tuple, sp),
                    ty,
                    self.cause(sp, ObligationCauseCode::RustCall),