syntax_data: {"ast_node_type":"other","tokens":[{"end":24,"kind":"keyword","start":0,"text":"Err(0)"}]}
source_snippet:             Err(0) => 0,
context_before:             Ok(i) => self.normalized_pos[i].diff,
context_after:             Err(i) => self.normalized_pos[i - 1].diff,