syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// doesn't allow mutable borrowing.
context_before: /// mutable or immutably. This type allows all of the above. It's similar to `Cow`, but `Cow`
context_after: enum CowMut<'a, T> {