{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"layout:"}]}
    layout: InternedSet<'tcx, LayoutData<FieldIdx, VariantIdx>>,
    bound_variable_kinds: InternedSet<'tcx, List<ty::BoundVariableKind>>,
    adt_def: InternedSet<'tcx, AdtDefData>,