syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // is `repr(transparent)`.
context_before:         // Casting to `Arc<ManuallyDrop<T>>` is safe because `ManuallyDrop`
context_after:         let ptr = Arc::into_raw(arc).cast::<mem::ManuallyDrop<T>>();