{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"tcx.ensure_ok().layout_of("}]}
                    tcx.ensure_ok().layout_of(
                    // Eagerly check the unsubstituted layout for cycles.
                        ty::TypingEnv::post_analysis(tcx, def_id.to_def_id())