syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // asserting that the line numbers here are all indeed 1-based.
context_before:         // FIXME: now that we handle DUMMY_SP up above, we should consider
context_after:         let hi_line = hi.line.saturating_sub(1);