{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"//"}]}
        // deserialized, the deserializer will need to know which crate it originally came
        // crate we are writing metadata for. When the metadata for *this* crate gets
        // from. We use `TAG_VALID_SPAN_FOREIGN` to indicate that a `CrateNum` should