syntax_data: {"ast_node_type":"other","tokens":[{"end":23,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // irrefutable.
context_before:         // If the list of witnesses is empty, the match is exhaustive, i.e. the `if let` pattern is
context_after:         Ok(if report.non_exhaustiveness_witnesses.is_empty() { Irrefutable } else { Refutable })