syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// the final type `&'a char` also refers to the region `'a` declared on
context_before:     /// variable will vary depending on where it appears. For example,
context_after:     /// the outermost fn. But this time, this reference is not nested within