{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"FnSubst,"}]}
    FnSubst, ImplTrait, ImplTraitId, ImplTraits, Interner, Lifetime, LifetimeData,
    AliasTy, Binders, BoundVar, CallableSig, Const, DebruijnIndex, DynTy, FnAbi, FnPointer, FnSig,
    LifetimeOutlives, PolyFnSig, ProgramClause, QuantifiedWhereClause, QuantifiedWhereClauses,