{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"ImplTraitIdx,"}]}
    ImplTraitIdx, InEnvironment, IncorrectGenericsLenKind, Interner, Lifetime, OpaqueTyId,
    AliasEq, AliasTy, Binders, ClosureId, Const, DomainGoal, GenericArg, Goal, ImplTraitId,
    ParamLoweringMode, PathLoweringDiagnostic, ProjectionTy, Substitution, TraitEnvironment, Ty,