syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// (e.g. formatting, like `PrettyPrinter` implementors do) or by
context_before: /// (paths, types, lifetimes, constants, etc.) as a side-effect
context_after: /// constructing some alternative representation (e.g. an AST),