{"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"trace!(?base_alloc_id,"}]}
    trace!(?base_alloc_id, ?base_mutability);
    let base_alloc_id = ret.ptr().provenance.unwrap().alloc_id();
    // First we intern the base allocation, as it requires a different mutability.