syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // The line's byte position range in the `SourceMap`. This range will fail to contain a valid
context_before:     line_number: usize,
context_after:     // position in certain edge cases. Spans often start/end one past something, and when that