syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> Result<Option<PatRangeBoundary<'tcx>>, ErrorGuaranteed> {
context_before:         expanded_consts: &mut Vec<DefId>,
context_after:         let Some(expr) = expr else { return Ok(None) };