syntax_data: {"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let scan_start = chunk_index * CHUNK_SIZE + intra_chunk_offset;
context_before:                     // There are multibyte chars in here, fallback to generic decoding.
context_after:                     intra_chunk_offset = analyze_source_file_generic(