{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"//!"}]}
//! DerefMut`. Now calling `foo.compute.mutate()` will result in a compile-time error stating that
//! `Frozen` impls `Deref`, so we can ergonomically call methods on `Bar`, but it doesn't `impl
//! `mutate` requires a mutable reference but we don't have one.