syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"last_file.end_position().0.checked_add(1).ok_or(OffsetOverflowError)?"}]}
source_snippet:             last_file.end_position().0.checked_add(1).ok_or(OffsetOverflowError)?
context_before:             // positions in the `SourceMap`, even in the presence of zero-length files.
context_after:         } else {