{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"///"}]}
///   arguments. An empty `TypedArena` will be created for each one, but the
/// - Types that are `!Copy` and `!Drop`: these must be specified in the
///   `DroplessArena` will always be used and the `TypedArena` will stay empty.