syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// is not equivalent to a character offset. The [`SourceMap`] will convert [`BytePos`]
context_before:     /// Because of multibyte UTF-8 characters, a byte offset
context_after:     /// values to `CharPos` values as necessary.