syntax_data: {"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":".unwrap_or_else(||"}]}
source_snippet:             .unwrap_or_else(|| span_bug!(span, "region_scope {:?} does not enclose", region_scope))
context_before:             .rposition(|scope| scope.region_scope == region_scope)
context_after:     }