syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
source_snippet: // function can read past `scan_len` if a multi-byte character start within the
context_before: // `scan_len` determines the number of bytes in `src` to scan. Note that the
context_after: // range but extends past it. The overflow is returned by the function.