syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// (`token_to_string`, `Ident::to_string`), except that symbols don't keep the rawness flag
context_before:     /// identical to printing the original identifier token written in source code
context_after:     /// or edition, so we have to guess the rawness using the global edition.