syntax_data: {"ast_node_type":"variable","tokens":[{"end":74,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut hash = SourceFileHash { kind, value: Default::default() };
context_before:     pub fn new_in_memory(kind: SourceFileHashAlgorithm, src: impl AsRef<[u8]>) -> SourceFileHash {
context_after:         let len = hash.hash_len();