{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"`size_of::<Option<T>>()`,"}]}
`size_of::<Option<T>>()`, where `T` is a `union` (regardless of whether or not
example, it is unspecified whether `size_of::<T>()` is equal to
it is transparent). The Rust compiler is free to perform this optimization if