syntax_data: {"ast_node_type":"variable","tokens":[{"end":38,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut inner = self.0.lock();
context_before:     fn intern_inner(&self, byte_str: &[u8]) -> u32 {
context_after:         if let Some(idx) = inner.byte_strs.get_index_of(byte_str) {