{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"//"}]}
        // means we can *not* easily intern immutably here if `prov.immutable()` is true and
        // interned memory -- justifying that we can indeed intern immutably. However this also
        // `inner_mutability` is `Mut`: there might be other pointers to that allocation, and