syntax_data: {"ast_node_type":"function","tokens":[{"end":93,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn lookup_file_pos_with_col_display(&self, pos: BytePos) -> (usize, CharPos, usize) {
context_before:     /// column offset when displayed, for a given `BytePos`.
context_after:         let pos = self.relative_position(pos);