{"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"IndexMap<I::PlaceholderTy,"}]}
        IndexMap<I::PlaceholderTy, I::BoundTy>,
        IndexMap<I::PlaceholderRegion, I::BoundRegion>,
        IndexMap<I::PlaceholderConst, I::BoundConst>,