{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"//"}]}
        // input `op` is a place, then turning it into a `ConstValue` and back into a `OpTy` will
        // We don't *force* `ConstValue::Slice` for `ScalarPair`. This has the advantage that if the
        // not have to generate any duplicate allocations (we preserve the original `AllocId` in