{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"//!"}]}
//! `computed` does not change accidentally (e.g. somebody might accidentally call
//! Now suppose we want to pass around a mutable `Foo` instance but, we want to make sure that
//! `foo.computed.mutate()`). This is what `Frozen` is for. We can do the following: