syntax_data: {"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"self.symbols.lock().entry(symbol).or_insert(span);"}]}
source_snippet:         self.symbols.lock().entry(symbol).or_insert(span);
context_before:     pub fn insert(&self, symbol: Symbol, span: Span) {
context_after:     }