{"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"key:"}]}
        key: ty::PseudoCanonicalInput<'tcx, Ty<'tcx>>
    query layout_of(
    ) -> Result<ty::layout::TyAndLayout<'tcx>, &'tcx ty::layout::LayoutError<'tcx>> {