syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"Some(self.file_for_position(pos)?)"}]}
source_snippet:             Some(self.file_for_position(pos)?)
context_before:         let new_file_and_idx = if !file_contains(&self.line_cache[oldest].file, pos) {
context_after:         } else {