syntax_data: {"ast_node_type":"variable","tokens":[{"end":48,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut inner = self.spans.borrow_mut();
context_before:     pub fn merge(&self, mut spans: FxHashMap<Symbol, Vec<Span>>) {
context_after:         // The entries will be moved to another map so the drain order does not