syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"Err(overlap)"}]}
source_snippet:                 Err(overlap) => (Some(overlap), None),
context_before:             let (overlap, used_to_be_allowed) = match insert_result {
context_after:                 Ok(Some(overlap)) => (Some(overlap.error), Some(overlap.kind)),