{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"//"}]}
        // not have to generate any duplicate allocations (we preserve the original `AllocId` in
        // input `op` is a place, then turning it into a `ConstValue` and back into a `OpTy` will
        // `ConstValue::Indirect`). It means accessing the contents of a slice can be slow (since