proc-macro panicked: called `Option::unwrap()` on a `None` value

``` bash
~: cargo --version
cargo 1.93.0-nightly (2a7c49606 2025-11-25)
~: rustc --version
rustc 1.93.0-nightly (1be6b13be 2025-11-26)
```

In this version's `cmd!()`, rust-analyzer flags this error.