syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> Result<RefutableFlag, ErrorGuaranteed> {
context_before:         scrut: Option<&Expr<'tcx>>,
context_after:         let (cx, report) = self.analyze_binding(pat, Refutable, scrut)?;