syntax_data: {"ast_node_type":"function","tokens":[{"end":75,"kind":"keyword","start":0,"text":"pub(crate)"}]}
source_snippet:     pub(crate) fn clear_top_scope(&mut self, region_scope: region::Scope) {
context_before:     /// entrance per pattern, but only one exit.
context_after:         let top_scope = self.scopes.scopes.last_mut().unwrap();