syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // If there's an error type, 'downgrade' our result from
context_before:         if candidates.is_empty() {
context_after:             // `Err(Unimplemented)` to `Ok(None)`. This helps us avoid