syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":".unwrap_or_else(||"}]}
source_snippet:             .unwrap_or_else(|| span_bug!(span, "no enclosing const-continuable scope found"));
context_before:             .rposition(|const_continuable_scope| const_continuable_scope.region_scope == scope)