syntax_data: {"ast_node_type":"function","tokens":[{"end":49,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn retain(&mut self, prefixes: &[&str]) {
context_before:     }
context_after:         self.0.retain(|(k, _)| prefixes.iter().any(|prefix| k.starts_with(prefix)));